Utilizes hi-tech materials and state of the art engineering to bring the ultimate in performance, value and style. All weather grips for easier handling in cold, wet, or high temperatures. Weatherproof lock cylinder for trouble free use. Strong, reversible automotive style key is easy to insert and remove even with gloves on. Fits comfortably on your key ring. Double chrome plating provides automotive grade durability and corrosion resistance. Strong, tough one piece machined carbon steel pin. Patented screw and lock security. Rugged, pick proof threaded connection that will not false lock. Fits 2-1/2" x 2-1/2" trailer hitches Class V or any hitch requiring a 3-5/8" span e.g. Chevy/GM HD truck linePin diameter: 5/8"Inside width: 3-5/8"Overall length: 6-7/8"