The Starrett Cordless Smooth Cut Hole Saw (51mm) is constructed from high-speed steel teeth that are hardened to resist heat and abrasion, ensuring long-lasting cutting performance. The tough alloy body and cap provide exceptional strength, durability, and shatter resistance, making it ideal for demanding applications. Specifically designed for use with battery-operated power tools, this bi-metal hole saw offers up to twice the number of cuts per battery charge compared to standard hole saws. Body material is steel