The Milwaukee 18-Piece Annular Cutter Set features dual alternating tooth geometry and thin-wall construction to deliver up to 15% faster cutting than the competition. The 20% thinner walls displace less material for the same size hole, giving users fast, burr-free holes in anything from sheet metal to thick steel plate. Milwaukee's 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: (2) 1/2 in., (2) 9/16 in., (2) 5/8 in., (2) 11/16 in., (2) 3/4 in., (2) 13/16 in., (2) 7/8 in., (2) 15/16 in. (2) 1-1/16 in. cutters, and (4) 2 in. pilot bits (centering pins).