Milwaukee®’s SHOCKWAVE™ Impact Duty™ step bits are engineered to deliver the most durable and fastest holes in 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 in. hex shank with an optimized Shockzone™ Milwaukee 48-89-9249 - SHOCKWAVE™ Impact Duty™ Step Bit #9 7/8 in. &1-1/8 in.