• Premium Quality Set of Total 20 pcs. 2.5mm Twist Diamond Drill Bits - Compatible with Dremel and Other Rotary Tools
• 2.5mm COLLET INCLUDED: This is required to hold 2.5mm diamond drill bits.
• Practical - Suitable to be used with electric, cordless hand drills, upright drills, flex shafts, and rotary tools such as Dremel, with small brass chucks.
• Perfect for Jewelry Design Necklaces Earrings, Pendants, Bracelets with Sea Shells, Beach Glass, Rocks
• Make Clean Holes in Tiles, Marble, Rocks, Ceramic, Porcelain, Gemstones
• Use with water - do not run dry.
• If a bit is not working well just try the next one.

Here are some simple DIY tips for DRILAX drill bits:

DIY TIP 1: A high-speed tool works best, speed is important, not pressure.

DIY TIP 2: Cooling is important. Keep the hole you're cutting constantly bathed in water. You can feed water to the drilling spot, always keeping it wet. Or you can submerge the whole piece in water in a plastic container. DO NOT SUBMERGE any electric tools.

DIY TIP 3: Use minimum pressure on the drill, just enough to let the diamond abrasive grind away the material. Using extra pressure will just damage the drill bit and not get you there any sooner.

DIY TIP 4: You may need some practice.

Other sets with different sizes are also available.