1/2" Square Drive Wobble Fix Extension Bar Set including varying lengths in plastic holder. Wobble-Fix refers to the section of the extension bar 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
1/2 Sq. Dr. Wobble-Fix Extension Bar set 50-250mm ABS Tray 5 pieces