REPLACEMENT SHOE GUIDE FOR HC1 Lightweight aluminum frames make this accessory extremely portable for a variety of hole cutting applications in sheet metal, including 20 gauge (1.02mm) galvanized steel. A compact model HC1 hole cutter is adjustable for making from 2 to 12 inches. (51 to 305 mm) diameter holes. The larger HC2 model cuts 2.3 inches to 20 inches. (51mm to 508mm) holes A combined English metric diameter gauge is included on the adjustable rotary vane for both, also the same router bit and spare parts.