JAM-FREE Performance: Dual-flute design provides greater speed and control Up to 2X faster: Optimized for cordless drills in high speed Rapid Strike™ Tip: Creates fast, accurate starts and generates less heat Up to 4X longer bit life: Optimized geometry with Black Oxide coating to cut faster and produce less heat Up to 50% more holes per battery charge: Greater user productivity Laser-engraved reference marks: Easily stop on any hole size 3-Flat Secure-Grip™ shanks: Reduces bit slippage in the chuck Made in the USA StyleDual-Flute Step Bits Increments1/16″ Pack Qty1 Pack CoatingBlack Oxide Shank Size3/8″ Hole Diameter1/4″ – 3/4″ Cutter GeometryDual-Flute ApplicationMetal|Plastic Number of Steps9