1、Firmly Inlaid at Top: The diamond on the top of the hole opener is firmly inlaid, not easy to fall off, low wear and tear, and can be used for a long time. 2、Thickened Alloy Carcass: The hole opener adopts thickened alloy carcass and has a universal round handle, which can be applied to a variety of models and has a wide range of applications. 3、Industrial Grade Carbon Steel: Hole opener made of industrial grade carbon steel, with nickel plated coating to resist corrosion, fine workmanship, super wear resistant, and pointed. 4、15 Sizes: This hole opener has 6, 8, 10, 12, 14, 16, 18, 20, 22, 25, 28, 30, 35, 40, 50mm sizes to meet various needs. 5、Uses: The hole opener is used to drill hard surfaces such as glass, wood, ceramic tile bottles, block jars, ceramics, slate, and granite pumice.