【Precise Positioning】: Compared with the traditional glass hole saw, our hole saw has a positioning aid. A pilot bit in the center helps you position accurately, ensures the bit does not slip or get stuck, and helps you drill precise holes. 【Cutting effect】: The surface coating diamond adopts sintering treatment. The cutting edge contains diamond particles from the inside out, which ensures that the cutting edge is always sharp. Low cutting resistance and stable drilling enable smooth, high-precision cutting without edge breakage for optimal cutting results. 【High-quality material】: The diamond hole saw is made of industrial-grade high-strength carbon steel with nickel-plated surface, which effectively prevents corrosion and rust. The diamond surface coating of the bit is thick and uniform, which improves the wear resistance and the service life of the hole saw. 【Chip disposal design 】: Our diamond drill bit adopts notch design with side clearance holes, which is convenient for