Diamond hole saws are meant for drilling into wall and floor tiles, stone, concrete, marble, and glass. Thanks to the diamond coating on the blade, they hold up well against wear when drilling tough materials. You can guide diamond hole saws using special guides or by using a piece of cardboard with a V-shaped notch cut into it. By placing the blade in the notch, it stays put until the cutting groove is formed. NOTE! You gotta use water during cutting! For wall and floor tiles, stone, concrete, marble, and glass Use water during cutting