Bosch 2608580421 HSS-Bimetal Hole Saw 2. 1/8in - 54mm Diameter The Bosch 2608580421 has a 2. 1/8in - 54mm diameter and a working depth of 38mm. It is designed to be used with Rotary Impact Drills or Rotary Hammer Drills. The bi-metal Hole Saw offers smooth cutting through various materials. The tooth configuration (Vario tooth strip) is ideal for gliding through material to provide smooth cuts. Made of bi-metal HSS (high-speed steel) containing 8% cobalt alloy, this hole saw has less risk of tooth breakage and higher heat resistance for long-lasting cutting. Use this hole saw when cutting through wood, metal and plastics The bi-metal Hole Saw fits all standard adapters on the market. Features: Bi-metal Hole Saw offers smooth cutting through various materials Tooth configuration (Vario tooth strip) is ideal for gliding through material to provide smooth cuts Made of bi-metal HSS containing 8% cobalt alloy for long-lasting cutting Fits threaded standard adapter Specification: Diameter: 2.1/8in - 54mm Working length: 38mm