Bosch Professional Hss Bi-Metal Holesaw For Standard Adapters 146 mm, 5 3/4"The bi metal Hole Saw fits all standard adapters on the market. 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,