IVY Classic 28120 11 Piece Cobalt Advantedge Bi-Metal Maintenance Hole Saw Kit are designed for their outstanding cutting performance and convenience. Constructed out of bi-metal with an M-3 cutting edge, these hole saws cut a variety of materials such as stainless and mild steel, non ferrous metal, plastic and wood with a 1-1/2-inch cutting depth. Additionally, their variable pitch, positive rake tooth design minimizes tooth wear and a thick backing plate prevents thread stripping and increases torque. These kits come in sturdy plastic cases and contain the most popular sizes for the professional. Contains hole saws: 3/4", 7/8", 1-1/8", 1-3/8", 1-1/2", 1-3/4", 2", 2-1/4", & 2-1/2". Contains arbors: 1H & 2H.