The dry hole saw is typically used for light weight work to drill through some types of brick and block. DO NOT USE ON CONCRETE OR HARD MATERIALS. The cutting edge either has saw teeth formed in it or industrial diamonds embedded in it. The sloping slots in the cylinder wall help carry the dust out. The kerf of the cut is designed to be slightly larger than the diameter of the rest of the hole saw so that it does not get jammed in the hole. Holes saws for use with portable drills are commonly available in diameters from 6 to 130 mm (0.24 to 5.1 in). The only limit on length of the cylinder, and thus depth of the hole, is the need to remove the bit from the hole to clear dust. By breaking the core off from time to time and using a shank extension, a diamond core drill can drill to depths many times its length. Saw teeth are used for most materials, such as wood, plastic, soft plaster, and metal. Diamond hole saws are used to bore holes in brick, concrete, glass, and stone.