13 Piece, General Purpose, Ice Hardened, Hole Saw Kit, Ice Hardened, Cryogenically Treated For Up To 50% Longer Life, Optimized Tooth Form For Up To 2X Faster Cutting, Bi-Metal Construction With 8% Cobalt For Increased Wear Resistance, Includes 1 Each Of The Following: 3/4", 7/8", 1-1/8", 1-3/8", 1-1/2", 1-3/4", 2", 2-1/8", 2-1/2" Hole Saws, 2 Arbors & 2 Pilot Bits.