Diamond Coated Hole Drill Bit Set

These custom-made diamond drill bits are excellent for drilling precise holes in some of the hardest materials around. Perfect for drilling holes in shells, glass, beads, sea glass, stone, and even concrete. As with all diamond drill bits you should use water as a lubricant and coolant. Since the drill bit is hollow, this allows the water to flow up inside and around the inner core as you are drilling, helping to keep the drill bit cool while removing the debris. Diamond drill bits are perfect for drilling holes through hard materials such as these: Glass, sea glass, beach glass, fused glass Stone, gemstones, rock, pebbles Ceramic, porcelain, tiles, glazed pottery, plates Shell, antler, bone, fossil Very hard wood 10 pc set contains the following sizes: 6mm, 8mm, 10mm, 14mm, 16mm, 18mm, 22mm, 35mm. 40mm, 50mm 15 pc set contains the the following sizes: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 40mm, 50 mm