You are Buying a Brand New And factory Sealed Klein Tools 1.375 in. High Speed Steel Double Flute Step Drill Bit Model #KTSB15. Product Overview 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. Two flutes on this Step Drill Bit cut faster and keep bit cooler Fast-starting, non-walking tip High-visibility silver targets for primary hole sizes 3 hole sizes. 1.375 in double flute bit offers faster cutting and drilling Easy-to-read step markings take less time to drill holes High-speed steel construction ensures durability.