Smooth Cutting - 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. Fits threaded standard adapter. Features and Benefits • Smooth Cutting in Various Materials • Tooth configuration (Vario tooth strip) is ideal for gliding through material to provide smooth cuts Specifications Diameter: 19; 22; 29; 38; 44; 57mm Working length: 40mm