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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 • 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 Specifications Diameter: 210mm Diameter 2: 8 1/4" Working Length: 44mm Working length: 44mm