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• 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 and junction boxes Specifications: Diameter = 20mm