Used to remove/install 5/16″ side terminals, Also 10mm battery terminals and hold-down fasteners.Socket allows for maximum hold on 10mm terminals and still allows room to access most 5/16″ side terminals.Extra length (9-3/4″) allows for easy access to recessed terminals.Vinyl grip insulates and helps prevent arcing.Lang 5/16″ X 10MM Extra Long Ratcheting Battery Terminal Wrench USA 6571