Drill America Carbide Tipped Annular Cutters are designed for fast, efficient hole making and cut only that material necessary to produce a quality hole. The carbide tips allows for fast drilling of larger diameter holes with longer life and the ability to perform in more abrasive and harder materials than high speed cutters. Sometimes called mag drills or magnetic drill bits, Drill America Annular cutters have a 3/4" Weldon Shank for use with magnetic drill press only. Do not use this cutter with a standard hand drill or drill press. Pilot pin included.