3-1/4" grit hole saw. Tungsten carbide gritted hole saws for heavy-duty cutting in ceramic tile, concrete block, cement backerboard, brick, fiberglass, plexiglass, PVC, wood with nails, cultured marble, and drywall. Up to 2-1/4" cutting depth. Not included - pilot drill bit (model No. 02953) and mandrels (model No. 02951 or 02957). 3-1/4"