Sandflex bi-metal holesaws work excellently in most materials such as wood, plastics, non ferrous and ferrous steel including stainless steel Fit all power drills, both stationary and portable Knockout holes allow easy removal of cores Cutting depth max 38 mm (1 1/2") 4/6 teeth per inch All -VIP holesaws are packed in a cardboard box with an instruction leaflet enclosed Max. holesize = nominal holesaw size +1.5 mm./- 0.0 Extra large sizes 168 and 210 mm with 6TPI and normal cutting depth 177 mm with 4/6TPI with cutting depth max 50 mm All large holesaws cut with 0 degree cutting angle to be less aggressive