Starrett Bi-Metal Cordless Smooth Cut Hole Saw assembly including arbour and pilot drill, specifically for cordless power tools. Heat resistant high speed steel edge, with alloy backing and constant pitch of 8 TPI for stainless and mild steel, sheet steel, plasterboard, wood and thin non-metallic. · · · Ideal for cutting stainless steel, mild steel sheeting plus plasterboards, wood and thin plastics · · Safety stop at the base of the hole saw prevents drilling beyond the maximum cutting depth · · Complete assembly including arbour and pilot drill · · Constant pitch teeth provide exceptionally smooth cuts pitch 8 teeth per 25mm/inch · · Saw design enables longer battery life of tool between changes