Ice Hardened™ cryogenically treated for up to 50% longer life. Optimized tooth form for up to 2X faster cutting. Wide, angled & offset slots for easy plug access. Bi-metal construction with 8% cobalt for increased wear resistance. Room for Additional Hole Saw and Arbor Storage. Includes; Six (6) Hole Saws: 3/4", 7/8", 1-1/8", 1-1/2", 1-3/4", 2-1/4". Two (2) Arbors with Pilot Bits: 49-56-7010, 49-56-9100. Two (2) Additional Pilot Bits: 49-56-8010. One (1) Adapter: 49-56-6560. One (1) Spacer: 49-67-0120.