Klein Tools KTSB01 Step Drill Bit Double-Fluted #1, 1/8 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'' hex shank provides a firm, positive grip and won't spin out in the drill.