Ice Hardened cryogenically treated for longer life. Optimized tooth form for faster cutting. Wide, angled and offset slots for easy plug access. Bi-metal construction with 8 percent cobalt for increased wear resistance. Kit includes: (1)1-1-2" Ice hardened bi-metal hole saw, (1) 1-1-8" Ice hardened bi-metal hole saw, (1) 1" Ice hardened bi-metal hole saw, (1) 1/8" hex key, (1) 3/4" Ice hardened bi-metal hole saw, (1) 7/8" Ice hardened bi-metal hole saw, (1) Hole saw adapter, (1) 1/4" x 3-1/2" high speed steel pilot bit. Also includes convenient case for organization and transport.