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Stripped 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.
Each 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.
Ideal 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.
| Material | M2 HSS High-Speed Steel, Titanium-Coated |
|---|---|
| Shank Type | 1/4" Hex Quick-Change |
| Overall Length | 70mm (≈2.76") |
| Pieces per Set | 5 |
| Screw Sizes Covered | #5, #6, #8, #10, #12 |
| Pilot Diameters | 5/64" (2mm), 3/32" (2.38mm), 7/64" (2.78mm), 1/8" (3.18mm), 9/64" (3.56mm), 5/32" (3.97mm) |
| Color | Black / Gold (titanium-coated cutting edges) |
| Compatible Drills | Cordless drill, corded power drill, air drill |
| Suitable Materials | Wood, plywood, MDF, fiberboard, particleboard, plastic, soft metals (aluminum) |
| Depth Adjustment | Adjustable via included hex (allen) wrench |
| Package Contents | 5× countersink drill bits (#5, #6, #8, #10, #12) + 1× allen wrench |
| Brand | HomeDIYer |
Match the bit to your screw number: #5 → 5/64" (≈2mm), #6 → 3/32" (≈2.38mm), #8 → 7/64" (≈2.78mm), #10 → 1/8" (≈3.18mm), #12 → 9/64" (≈3.56mm). 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.
These bits are designed for wood, plywood, MDF, fiberboard, particleboard, plastic, and soft metals 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.
Yes. The 1/4" hex shank 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.
The 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.
Yes — 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 2–5mm depending on screw head size and material. The overall bit length is 70mm (≈2.76"), giving you plenty of working range for most applications.
The set includes 5 countersink drill bits (one each for #5, #6, #8, #10, #12 screws) plus 1 allen (hex) wrench for adjusting pilot bit depth. No additional tools are required beyond a standard drill.
The 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 low drill speed and increase gradually — this is especially important on smooth surfaces like melamine or plastic where bit walking is more likely.
A 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.
