The 11mm (7/16") Universal QUIK-LOK Extension has an innovative design that fits all 11mm (7/16") shanks - with or without a power-groove. The unique design requires no tools to change out bits, making it fast and efficient. These new extensions are impact rated for maximum durability. Key Features Universal QUIK-LOK™ - Accepts all 11mm (7/16") shanks Tool Free Connection - Quick change of bits with no hex key required Impact Rated - Making this the most versatile extension on the market Hardened Shank - For maximum durability Shank: 7/16"-Hex - With Power Groove Drive Size: 7/16"-Hex - Quick-Change For use with: MILWAUKEE® 7/16"-Hex Shank Accessories SHOCKWAVE™ Power Utility Auger Bits SWITCHBLADE™ Self-Feed Bits Specifications Part Number 48281030 Brand Milwaukee Item Type Drill Bit Extension Length 140 mm