Annular cutters are designed for fast, efficient hole making and cut only that material necessary to produce a quality hole. 3/4" Weldon shank features a round shank with one of more flats machined into the side for easy indexing and alignment. Fits most magnetic drill presses. High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance Pilot pin included. For use with magnetic drill press only. Do not use with a standard hand drill or drill press