Spinner Handle with 1/4″ Square Drive Wobble Fix end in 220mm Length. Wobble-Fix refers to the section of the shaft that holds the socket. Specifically, in reference to the flexibility of movement that a socket has when attached to an extension bar with this feature. Wobble-Fix extension bars offer two different secure solutions for holding a socket in place. The Fix solution holds the socket securely and steadily on the extension bar permitting no movement. The Wobble solution permits movement of up to a 15 degree angle