35mm Hole Saw, Diamond Drill Bit with Central Guide Drill, with Diamond Surface Coating for Cutting Glass, Tile, Ceramic, Marble, Limestone 【PRECISE POSITIONING】: Compared with standard hole saws for traditional glass, our hole saws have positioning aids. The pilot drill in the center can help you position accurately, ensure that the drill does not slip, get stuck, and help repair the drill. Drill precise holes. 【CUTTING EFFECT】: The diamond surface coating adopts the 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 resistance to stable cutting and drilling ensure smooth, high-precision cuts without broken edges for optimal cutting results. 【HIGH QUALITY MATERIAL】】: Diamond hole saws are made of steel to carbon high resistance Industrial and the surface is nickel-plated, which is effective against corrosion and rust. The diamond surface coating of the drill bit makes the coating