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™ Provide The Industry’S Most Durable Shank, Reducing Early Shank Breaks. A Titanium Aluminum Nitride (Tibone) Coating Helps Deliver 5X Longer Life, While The Rapid Strike™ Tip and Dual Spiral