The SK Hand Tool 1/4" Power Drive Locking Extensions offer various extension lengths to provide solutions for hard-to-reach areas. Extensions lock into power drives, thus preventing accidental disconnection during use. A knurled sleeve provides easy attachment and removal of sockets. The one-handed lock mechanism with ball retention ensures socket retention and allows for faster socket attachment and removal. These tools come with a black oxide finish to help protect against corrosion. They can be purchased in three sizes and a three-piece set.