"I puschased this hole saw for cutting a hole in 2mm mild steel register plate. It utterly failed to do this It scratched the surface,but after half an hour it was making no impression.and the teeth were worn out. I used a coolant to to aid cutting but this made no diffrence. I had to resort to a jig saw which floated through the 2 mm plate effortlessly. This was dissapointing as I searched the Screwfix website for a metal cutting holesaw and it advertised it as being suitable."