Includes arbor and pilot bit. Cuts abrasive construction materials. Tungsten carbide grit edge is self-sharpening for long cutting life. Arbor design allows for easy removal of cut material plug. For the builder, tile setter, homeowner, do-it-yourselfer, construction worker and other professionals. Drills ceramic tile, concrete block, cement board, brick, fiberglass, plexiglass, PVC (polyvinyl chloride), wood, cultured marble, drywall, plastic and nail embedded wood. Not recommended for use on metal. 3/8" shank. Set includes 1 each 1-1/4", 1-3/4", 2-1/8", 2-1/2" grit hole saws, arbor and pilot bit Model No. 02885 (SKU 301767).