Shank: 3/16"Material: Aluminum Frame, Steel BitCutting Diameter: 2" To 12"Cutting Thickness: Up To 20 Gauge Galvanized SteelVersatile Metal Cutter For Roofing, Siding, Fiber Cement Backerboard, Sheet Metal And MoreUse With Any Corded Or Cordless DrillA Combination English/Metric Diameter Gauge Is Included On The Adjustable Pivot Slide Drill Bit Is Replaceable, Model #MALCBMax RPM: 1,350