Features and Benefits:�3-Flat Secure-Grip™ shanks: Reduces bit slippage in the chuck�JAM-FREE Performance: Dual-flute design provides greater speed and control�Laser-engraved reference marks: Easily stop on any hole size�Made in USA�Rapid Strike™ Tip: Creates fast, accurate starts and generates less heat�Up to 2X faster: Optimized for cordless drills in high speed�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 productivityThe Milwaukee Tool line of step drill bits far surpasses the competition. With our single cutting edge design, you will have more control and a cleaner finish. Made of high speed steel, these new step drill bits are durable and designed to drill through most metals. The black oxide finish prevents corrosion and has great capacity to work with drilling lubricants. The new speed start tip prevents bit walking and allows faster penetration. With laser etched markings you will always know your hole sizes...no guess work! Finally, the 1/4 in. hex shank allows for fast bit change in impact drivers and sure grip in chucks.