Features and Benefits:?Exclusive QUIK-LOK? accepts all 7/16" shanks?Impact Rated, making this the most versatile extension on the market?Quick change of bits, no tools requiredThe 7/16 in. universal Quik-Lok extension has an innovative design that fits all 7/16 in. shanks - with or without a power-groove. The uniques design requires no tools to change out bits, making it fast and efficient. These new extensions are impact rated for maximum durability.