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. Slim line design reduces frictional heat build up and prevents tooth burn out. Compatible with impact drills – E6,3 Drive System. Fared shoulders prevent over drilling – avoids damaging inner components of electrical cabinets and junction boxes. Contents: each 1 piece 20, 25 & 32 mm. Individual sizes as well as more sizes are separately under Code T3202 available.