The Bosch 2608580440 is an HSS-Bimetal Hole Saw with a 4in - 102mm diameter and a working depth of 38mm. It is designed for use with Rotary Impact Drills or Rotary Hammer Drills. The bi-metal Hole Saw offers smooth cutting through various materials. Its Vario tooth strip configuration provides smooth cuts by gliding through material. Made of bi-metal HSS (high-speed steel) with an 8% cobalt alloy, this hole saw is resistant to breakage and has higher heat resistance for long-lasting cutting. Use this hole saw for cutting through wood, metal, and plastics. It fits all standard adapters on the market. Features: Bi-metal Hole Saw for smooth cutting through various materials. Vario tooth strip for ideal gliding and smooth cuts. Made of bi-metal HSS with 8% cobalt alloy for durability. Fits standard threaded adapters. Specifications: Diameter: 4in - 102mm. Working length: 38mm.