Tooth configuration optimised for the fast cutting of sheet steel cuts sheet steel faster than standard hole saws 8 teeth per inch for a smoother cutting action cleaner holes with no burring premium grade 8 cobalt alloy steel construction for an extended working life slimline design reduces frictional heat build up and prevents tooth burn out compatible with impact drills e6 3 drive system flared shoulders prevent overdrilling avoids damaging inner components of electrical cabinets a