Starrett CSC22 22mm cordless smooth cut, Bi-metal hole saw

Constructed of hardened heat and abrasion resistant high speed steel teeth, with a tough alloy body and cap, the Bi-Metal Cordless Smooth Cut offers exceptional strength, durability and shatter resistance. It is designed for use with battery operated power tools and will cut twice as many holes as the equivalent standard hole saw per battery charge. Its flared base cap limits cutting depth to 13mm (1/2″).