The bi-metal Hole Saw fits all standard adapters on the market. It offers smooth cutting through various materials thanks to its Vario tooth strip configuration, which 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 hole saw has a 2 1/2in - 64mm diameter and a working depth of 38mm. It is designed to be used with Rotary Impact Drills or Rotary Hammer Drills.