Klein Tools 13-Step Drill Bit, Double-Fluted, 1/8-Inch to 1/2-Inch

These Double-Fluted Step Drill Bits provide faster cutting and drilling than single flute bits. The easy-to-read step markings and targets save time when drilling holes. Thick 3/8-Inch hex shank provides a firm, positive grip and won't spin out in the drill.