Heavy-duty Turbo Shear shear attachment. Heavy-duty, attachment inserts into chuck of 3/8 In. or 1/2 In. drills. Cuts straight and to the left, up to 20-gauge galvanized steel, also cuts 18-gauge steel. Ideal for cutting in ferrous and nonferrous sheet metals, metal roofing/building panels, vinyl, steel mesh, and ductwork. Offset design keeps both hands away from work surface. Also makes angled crosscuts through profiles of metal building panels and stone-coated metal shingles.