Got a craft project involving sea glass, stones, or shells? This 30-piece diamond drill bit set is your new best friend. It's made for precision drilling in hard, brittle materials. You get 10 bits each of three super useful sizes: 1mm, 2mm, and 3mm tip diameters. The shank is 1/8 inch (3mm), so it fits perfectly in most Dremel rotary tools and other drills with a standard collet. Each bit has a diamond-coated tip that grinds through material rather than cutting, which is way better for glass and ceramics. A huge tip: ALWAYS use water when drilling! Submerge your piece or keep a steady drip going. It cools the bit and the material, prevents cracking, and makes the bits last way longer. Start at a slight angle to create a little groove, then drill straight in. Use low to medium speed and gentle pressure – let the diamond grit do the work. They come in a handy clear plastic case with foam, so you can keep them organized and protected. Perfect for making holes in beach glass for pendants, drilling shells, working with agate, or any detailed DIY lapidary project. A great value pack for hobbyists and jewelry makers.