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 -C holesaws are packed in a nice self-service packing with an instruction leaflet that also works as a tooth protector|Max. holesize = nominal holesaw size 1.5 mm./- 0.0|All large holesaws cut with 0 degree cutting angle to be less aggressive