DeWalt D180001MG 8 Piece Plumbers Hole Saw Kit Contains the most commonly used sizes Optimized tooth design for superior performance while cutting metal M3 steel provides longer life than the M2 steel of the industry standard product Hardened backing plates prevent warping thus allowing for easier removal from the mandrel Versatility of Deep Cut style allows users to cut either wood or metal One 3/4 (19mm) Bi-Metal Hole Saw One 7/8" (22mm) Bi-Metal Hole Saw One 1-1/8" (29mm) Bi-Metal Hole Saw One 1-1/2" (38mm) Bi-Metal Hole Saw One 1-3/4" (44mm) Bi-Metal Hole Saw One 2-1/4" (57mm) Bi-Metal Hole Saw One 1/4" Mandrel (9/16" to 1-3/16") One 7/16" Quick Change Mandrel (1-1/4" to 6")