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. Includes; Five (5) Hole Saws: 3/4", 7/8", 1", 1-1/8", 1-1/2". One (1) Twist-Release™ Arbor with Pilot Bit: 49-56-7210. One (1) Additional Pilot Bit: 49-56-8010. One (1) 1/8" Hex Key. One (1) Adapter: 49-56-6560.