Includes receiver lock and coupler lock which are keyed alike. Square key eliminates lock picking and offers thousands of combinations. Ball bearing locking system eliminates weak points. Constructed with chrome-plated steel with rubber cap and O-rings for weather resistance. Class III/IV. 5/8″ diameter. No. 7030600: Material: Chrome Plated, Coupler Size: 5/8″ Dia, Key Design: Square
