Rugged, pick-proof, threaded connection that won't false lock. 5/8" diameter for Class III, IV and V hitches. Strong, automotive style key is easy to insert and remove. Weatherproof lock cylinder for trouble-free use. Soft grip pin knob is easy to grip in cold or wet weather. Tough one-piece machined carbon steel pin construction. Double chrome plated finish for maximum rust resistance. 2 keys. Priced each.