ARTU 6-Piece Tungsten Carbide Grit Hole Saw Set 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 Material Tungsten Carbide Grit, Pieces In Set 6 Pcs., Pkg Qty 1, Package Type Clamshell