Designed With A Robust 1/4 In. Quick Change Hex Shank, Milwaukee® Shockwave™ Impact Duty™ Hole Saws Give Professionals A Hole Making Solution to Use With Impact Drivers. Utilizing A Thin Wall, 8 Tpi Design, Shockwave™ Impact Hole Saws Deliver A Burr-Free Cut Up to 40% Faster Than Standard Bi-Metal Hole Saws. The Included Ejection Spring Removes The Frustration Of Manually Removing Slugs By Automatically Ejecting The Material. A Stop Shoulder Design Prevents Over-Drilling Into Material and Potentially Damag