2x longer lifetime the bim progressor hole saw offers 2x longer lifetime than its predecessor. It has been redesigned with bosch bi metal with 8% cobalt alloy for increased durability. Additionally, it has an enhanced progressive tooth strip that enables faster cuts. Use this hole saw when drilling holes in wood, drywall, plastics, metal, non ferrous metal and stainless steel. It is suitable for use with all corded and cordless drill drivers. For use with the bosch power change plus keyless arbor offering accuracy and robustness. Features and benefits bull long life bull bim progressor hole saw offers 2x longer lifetime than predecessor bull redesigned with bi metal with 8% cobalt alloy for increased durability specifications diameter 68mm diameter 2 2 3 4 working length 44mm working length 44mm