【PRECISE POSITIONING】: Compared with traditional glass hole saws, our hole saws have positioning aids. The pilot drill in the center can help you position accurately, ensure that the drilling will not slip or get stuck, and help you drill precise holes. 【CUTTING EFFECT】: The diamond surface coating adopts sintering processing method. The cutting edge contains diamond particles from the inside to the outside to ensure that the cutting edge is always sharp. Low cutting resistance and stable drilling create high-precision smooth cuts without broken edges for optimal cutting results. 【HIGH QUALITY MATERIAL】Diamond hole saws are made of industrial grade high-strength carbon steel, and the surface is nickel-plated, which is effective against corrosion and rust. The diamond surface coating of the drill bit, the coating is thick and uniform, and the wear resistance and service life of the hole opener are improved. 【CHIP REMOVAL DESIGN】 : The cutting head of our diamond drill adopts a notch