Dual alternating tooth geometry and thin-wall construction help Milwaukee's durable 9-piece annular cutter set cut up to 15% faster than the competition. With 20% thinner walls, these cutters displace less material for the same size hole, giving you fast, burr-free holes in anything from sheet metal to thick steel plate. Milwaukees proprietary high-speed steel with three hardness zones minimizes breakage and helps the bits last longer. Each cutter comes with a 3/4 in. Weldon shank, which is ideal for use with most small magnetic drill presses and large magnetic drill presses with the correct arbor. The kit includes 1/2 in., 9/16 in., 5/8 in., 11/16 in., 3/4 in., 13/16 in., 7/8 in., 15/16 in. and 1-1/16 in. cutters, two 2 in. pilot bits (centering pins) and a sturdy carrying case.