8 Piece Plumbers Kit includes 3/4-Inch, 7/8-Inch, 1-1/8-Inch, 1-1/2-Inch, 1-3/4-Inch, 2-1/4-Inch Shark Tooth Bi-Metal Hole Saws and two arbors with pilot drill bits. Shark-Tooth Bi-Metal Hole Saws are professional bi-metal saws with cobalt high speed steel teeth, electron welded to shatterproof, shock absorbing alloy bodies. Shark Tooth"s variable pitch tooth pattern cuts clean through stainless steel, brass, aluminum, pipe steel, nail embedded wood, hardwood, plywood, sheet metal, fiberglass and plastic. l.