{"product_id":"hss-countersink-drill-bit-set-hex-shank-6pcs","title":"5Pcs HSS Countersink Drill Bit Set – 1\/4\" Hex Shank, Self-Centering Pilot Holes for Wood \u0026 Plastic (#5 #6 #8 #10 #12 #14)","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eHSS Countersink Drill Bit Set – Clean Flush Screw Holes Every Time\u003c\/h2\u003e\n\u003cp\u003eStripped screw heads, split wood edges, and uneven pilot holes are the hallmarks of using the wrong bit for the job. Whether you're a weekend woodworker building cabinet frames, a contractor installing decking, or a DIYer assembling furniture, this 6-piece HSS countersink drill bit set gives you the right size for every common screw — drilled cleanly in a single pass.\u003c\/p\u003e\n\u003cp\u003eEach set includes 6 countersink drill bits in sizes #5, #6, #8, #10, #12, corresponding to pilot diameters of 5\/64\" (≈2mm), 3\/32\" (≈2.38mm), 7\/64\" (≈2.78mm), 1\/8\" (≈3.18mm), 9\/64\" (≈3.56mm). All bits are made from M2 HSS high-speed steel with a titanium coating and feature a 1\/4\" hex quick-change shank (70mm \/ ≈2.76\" overall length). An allen wrench is included for adjusting pilot bit depth.\u003c\/p\u003e\n\u003cp\u003eIdeal for countersinking wood screws in plywood, MDF, and solid lumber for furniture assembly and cabinet installation; creating clean pilot holes in plastic panels and fiberboard for electronics enclosures; and drilling soft metals like aluminum sheet for light fabrication work — all without switching bits or chucks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Fits all standard cordless drills, power drills, and air drills with a 1\/4\" quick-change chuck or standard 3-jaw chuck. Compatible with screw sizes #5, #6, #8, #10, #12.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These HSS Countersink Drill Bits\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e5-Size Set in One Kit\u003c\/strong\u003e — Covers the most common wood screw sizes (#5 through #14) so you can countersink pilot holes for flush screw heads without swapping between multiple sets.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e1\/4\" Quick-Change Hex Shank\u003c\/strong\u003e — Snaps into any quick-change chuck in seconds, eliminating the need for a key or adapter. Also fits standard 3-jaw chucks on cordless and corded drills.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSelf-Centering Tip Design\u003c\/strong\u003e — The tapered point locates the center of your mark automatically, reducing bit walking on smooth surfaces like plastic and melamine-coated board.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eAdjustable Pilot Bit Depth\u003c\/strong\u003e — The included hex wrench lets you reposition the inner pilot drill to control countersink depth precisely — useful when working with different screw lengths or material thicknesses.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eM2 HSS with Titanium Coating\u003c\/strong\u003e — M2 high-speed steel resists heat buildup during extended drilling sessions, while the titanium coating reduces friction and extends cutting edge life compared to uncoated steel bits.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e🛠️Wide Material Compatibility\u003c\/strong\u003e — Cuts cleanly through wood, plywood, MDF, fiberboard, particleboard, plastic, and soft metals like aluminum — making this set a practical choice for woodworking, cabinetry, and light fabrication.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — HSS Countersink Drill Bit Set\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable style=\"width: 100%; height: 350.688px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 19.5938px;\"\u003eMaterial\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 19.5938px;\"\u003eM2 HSS High-Speed Steel, Titanium-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 19.5938px;\"\u003eShank Type\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 19.5938px;\"\u003e1\/4\" Hex Quick-Change\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 17.5938px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 17.5938px;\"\u003eOverall Length\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 17.5938px;\"\u003e70mm (≈2.76\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 19.5938px;\"\u003ePieces per Set\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 19.5938px;\"\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 39.1875px;\"\u003eScrew Sizes Covered\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 39.1875px;\"\u003e#5, #6, #8, #10, #12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 39.1875px;\"\u003ePilot Diameters\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 39.1875px;\"\u003e5\/64\" (2mm), 3\/32\" (2.38mm), 7\/64\" (2.78mm), 1\/8\" (3.18mm), 9\/64\" (3.56mm), 5\/32\" (3.97mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 19.5938px;\"\u003eColor\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 19.5938px;\"\u003eBlack \/ Gold (titanium-coated cutting edges)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 39.1875px;\"\u003eCompatible Drills\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 39.1875px;\"\u003eCordless drill, corded power drill, air drill\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 39.1875px;\"\u003eSuitable Materials\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 39.1875px;\"\u003eWood, plywood, MDF, fiberboard, particleboard, plastic, soft metals (aluminum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 39.1875px;\"\u003eDepth Adjustment\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 39.1875px;\"\u003eAdjustable via included hex (allen) wrench\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 39.1875px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 39.1875px;\"\u003ePackage Contents\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 39.1875px;\"\u003e5× countersink drill bits (#5, #6, #8, #10, #12) + 1× allen wrench\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 20.6279%; height: 19.5938px;\"\u003eBrand\u003c\/th\u003e\n\u003ctd style=\"width: 76.515%; height: 19.5938px;\"\u003eHomeDIYer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSize Confirmation:\u003c\/strong\u003e If you need a size not listed above, contact us before ordering — we carry additional sizes not shown in this listing.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eHow do I choose the right countersink size for my screws?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the bit to your screw number: \u003cstrong\u003e#5 → 5\/64\" (≈2mm)\u003c\/strong\u003e, \u003cstrong\u003e#6 → 3\/32\" (≈2.38mm)\u003c\/strong\u003e, \u003cstrong\u003e#8 → 7\/64\" (≈2.78mm)\u003c\/strong\u003e, \u003cstrong\u003e#10 → 1\/8\" (≈3.18mm)\u003c\/strong\u003e, \u003cstrong\u003e#12 → 9\/64\" (≈3.56mm).\u003c\/strong\u003e When in doubt, go one size up — a slightly larger countersink is easier to fill with wood putty than a screw head that won't sit flush.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhat materials can these countersink bits drill into?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese bits are designed for \u003cstrong\u003ewood, plywood, MDF, fiberboard, particleboard, plastic, and soft metals\u003c\/strong\u003e such as aluminum sheet. They are not intended for hardened steel, stainless steel, concrete, or masonry. For best results in soft metals, use a cutting lubricant and reduce drill speed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eAre these bits compatible with my cordless drill?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e1\/4\" hex shank\u003c\/strong\u003e is the industry-standard quick-change size and fits virtually all cordless drills, corded power drills, and air drills — whether they use a quick-change chuck or a standard 3-jaw chuck. No adapter is needed in most cases.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eCan I use these bits outdoors or in humid conditions?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe titanium coating generally provides better corrosion resistance than bare HSS. For prolonged outdoor or high-humidity use, we recommend wiping the bits dry after use and applying a light coat of machine oil to the cutting edges. Store in the included case to prevent moisture exposure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eHow deep can I countersink, and can I adjust the depth?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — depth is fully adjustable. The included hex wrench lets you slide the inner pilot drill up or down inside the countersink body. Typical countersink depth is \u003cstrong\u003e2–5mm\u003c\/strong\u003e depending on screw head size and material. The overall bit length is 70mm (≈2.76\"), giving you plenty of working range for most applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eWhat is included in the set, and do I need any extra tools?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe set includes \u003cstrong\u003e5 countersink drill bits\u003c\/strong\u003e (one each for #5, #6, #8, #10, #12 screws) plus \u003cstrong\u003e1 allen (hex) wrench\u003c\/strong\u003e for adjusting pilot bit depth. No additional tools are required beyond a standard drill.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eHow do I prevent the pilot bit from slipping or walking during drilling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe self-centering tip design helps locate the center of your mark automatically. Before drilling, tighten the set screw firmly with the included hex wrench. Start at a \u003cstrong\u003elow drill speed\u003c\/strong\u003e and increase gradually — this is especially important on smooth surfaces like melamine or plastic where bit walking is more likely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails open=\"\"\u003e\n\u003csummary\u003eHow does this set compare to a standard twist drill bit for making pilot holes?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA standard twist bit only drills a cylindrical hole — it does not create the tapered recess needed for a flat-head screw to sit flush. A countersink bit combines the pilot hole and the tapered countersink in a single pass, saving time and reducing the risk of wood splitting near the surface. For flush-mount flat-head screws, a countersink bit is generally the correct tool.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Default Title","offer_id":52285566877970,"sku":"US-TZ0039","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_edc6b36f-b0b2-4462-833c-d7877d2cd33c.jpg?v=1780502828","url":"https:\/\/homediyer.com\/products\/hss-countersink-drill-bit-set-hex-shank-6pcs","provider":"HomeDIYer","version":"1.0","type":"link"}