Diamond hole saws are intended for drilling wall and floor tiles, stone, concrete, marble and glass. The diamond coating on the blade makes them highly resistant to wear when drilling hard materials. Diamond hole saws can be guided using special guides or using a piece of cardboard with a V-shaped notch cut into it. By placing the blade in the notch, the blade remains in place until the cutting groove is formed. NOTE! Water must be used for cutting! For wall and floor tiles, stone, concrete, marble and glass Water used for cutting