Diamond Drill Bit Set — 15 Sizes for Every Hard-Material Job
Struggling to drill clean, chip-free holes through tile, glass, or stone without cracking the surface? Whether you're a weekend renovator or a seasoned tradesperson, the wrong bit can ruin an expensive slab in seconds. This 15-piece diamond drill bit set gives you the right size every time — from a precise 6 mm pilot hole to a wide 50 mm core cut — so you can work confidently on the toughest surfaces.
Each bit is constructed with an iron body and a diamond-coated cutting edge, covering diameters from 6 mm (approx. 1/4 in) to 50 mm (approx. 2 in). The set includes one bit each at 6, 8, 10, 12, 14, 16, 18, 20, 22, 25, 26, 28, 30, 40, and 50 mm, giving you 15 distinct sizes in a single purchase.
Use these bits for bathroom tile installations, glass shelf mounting, marble countertop cutouts, granite backsplash work, and ceramic art projects — anywhere a standard twist bit would slip or shatter the material.
🔧 DIY Home Renovators
Installing a new bathroom, tiling a kitchen backsplash, or mounting glass shelves? This set covers every hole size you'll need without buying individual bits for each project.
💼 Tile & Stone Contractors
Professionals working with porcelain stoneware, marble slabs, and granite countertops need bits that stay sharp across multiple jobs. The diamond coating and chip-removal design keep pace with demanding site work.
🎨 Ceramic & Glass Artists
Drilling precise holes in glass panels, ceramic pots, or slate art pieces requires control and a bit that won't crack the workpiece. The center guide hole ensures accurate placement every time.
🏗️ General Contractors & Maintenance Teams
From concrete anchor holes to plumbing pass-throughs in tile walls, having 15 sizes on hand means fewer trips to the supply store and faster job completion.
Do I need water when using these drill bits?
Water or coolant lubrication is strongly recommended when drilling hard materials such as granite, marble, and glass. It reduces heat buildup at the cutting tip, which extends bit life and helps prevent cracking the workpiece. For softer ceramics or tile, a small amount of water is still beneficial.
What drill speed should I use?
A lower RPM is generally better for diamond bits — typically in the range of 600–1,500 RPM depending on the material and bit diameter. Larger diameter bits require slower speeds. Avoid high-speed dry drilling, as this generates excessive heat and shortens bit life.
Can I use these bits with a standard cordless drill?
Yes. These bits are compatible with standard corded and cordless drills that accept a round or hex shank. Ensure your drill chuck can accommodate the shank size of the bit you're using before starting.
Will these bits work on tempered glass?
Tempered glass cannot be drilled after tempering — attempting to do so will shatter the glass. These bits are suitable for non-tempered (annealed) glass only. Always confirm the glass type before drilling.
How do I prevent the bit from wandering on a smooth tile surface?
The center guide hole helps with alignment, but for very smooth surfaces like polished porcelain, you can use a small piece of masking tape over the drill point or a drill guide template to keep the bit from sliding on entry.
How long will the diamond coating last?
Lifespan depends on the material being drilled, drilling speed, and whether water cooling is used. With proper technique and lubrication, each bit can typically complete multiple holes per size. Dry drilling hard stone will significantly reduce coating life.
Are these bits suitable for concrete walls?
Yes, these bits are rated for concrete as well as stone and tile. For reinforced concrete, a hammer drill setting is not recommended with diamond bits — use standard rotary mode with water cooling for best results.
Get the complete 15-piece diamond drill bit set and tackle glass, marble, granite, and tile with confidence. Add to cart today and have the right size ready for every job.
