Bosch 2608594222 HSS-Bi-Metal Progressor Holesaw for Wood and Metal 57mm The Bosch 2608594222 HSS-Bi-Metal Holesaw has a diameter of 57mm and a working length of 44mm. 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. Features: BiM Progressor Hole Saw offers 2x longer lifetime than predecessor Redesigned with Bi-Metal with 8% cobalt alloy for increased durability Enhanced progressive tooth strip enables faster cuts Suitable for multipurpose use Specification: Part Number: 2 608 594 222 Diameter: 57mm / 2. 1/4in Working Length: 44mm