48-28-1020 Milwaukee 12" x 1/4" Universal Quik-Lok Extension  The 1/4" Universal QUIK-LOK Extension has an innovative design that fits all 1/4" shanks - with or without a power-groove. The uniques design requires no tools to change out bits, making it fast and efficient.  Features:Universal Quik-Lok - Accepts ALL 1/4" shanks1/4" Tooless Quick Change - No Hex Key NeededHardened Shank For Maximum Durability Specifications:•  Length: 12"•  Shaft: 1/4" Hex