Replacement Shoe Guide for the HC1: Lightweight aluminum frames make these accessories extremely portable for a variety of hole cutting applications in sheet metal including 20-gauge (1.02 mm) galvanized steel. A compact model HC1 Hole Cutter is adjustable for making 2 to 12 in. (51 to 305 mm) diameter holes. The larger HC2 model cuts 2 to 20 in. (51 to 508 mm) holes. A combination English-Metric diameter gauge is included on the adjustable pivot slide for both, also including the same mill-type Cutter Bit and replacement parts.