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 • Long Life • BiM Progressor Hole Saw offers 2x longer lifetime than predecessor • Redesigned with Bi-Metal with 8% cobalt alloy for increased durability Specifications Diameter: 54mm Diameter 2: 2 1/4" Working Length: 44mm Working length: 44mm