Trimax TBB43 4-3/8" and 2-3/4" Keyed Alike Receiver Pin Lock Set The 5/8" pin fits all Class III, IV and V receiver hitches The extended pin fits the Rapid Hitch System by Andersen Exclusive internal O-ring and cap help seal out dirt and corrosion for trouble free use High quality tubular key won't bend or break Rugged lock can't "pop" open or be false locked