Milwaukee® SHOCKWAVE™ Impact Duty™ Step Bits are engineered to deliver the most durable and fastest holes on the market. Made in the USA with global materials, these step bits have best-in-class performance in impact drivers and the versatility to be used in drills. The 1/4" hex shank with an optimized SHOCKZONE™ provides the industry's most durable shank, reducing early shank breaks. An aluminum titanium nitride (TiBone) coating helps deliver 5X longer life, while the Rapid Strike™ tip and dual spiral flute produce 2X faster holes.