Coupler lock for lever style trailer couplers requiring a 2 span. Locks trailer to hitch ball when in use. Helps prevent attaching to an unattended trailer. Coupler Lock with housing and knob cones for flush locking design. Pin Diameter: 1/4, Inside Width: 2, Overall Length: 5.625. Product Features:Double nickel chrome platePatented, pick-proof screw and lock securityFlush locking designMade in the USA