1、Long 5/8\" diameter locking hitch pin with maximum active length 3-1/2\", fits Class III,IV,V hitches with 2\", 2.5\" and 3\" receivers. (Please verify you the size of your hitch and get a suitable hitch pin lock) 2、Constructed from heavy-duty iron and finished with black e-coated to increase the wear resistance and rust resistance. 3、Watertight dust cap can protect the keyhole from water and dirt. 4、A separate spring clip and 2 holes provide additional safety, 2 clip holes one for 2\" x 2\" receivers another for 2.5\" x 2.5\" receivers. Rubber O-rings prevent any rattling and hold the hitch pin still. 5、With push-to-lock technology and 1/4-turn lock, make it easy to lock and unlock the hitch lock set. The 5/8" hitch pin lock set comes with spring clip and 5 rubber O-rings, push lock design make it easy to use for heavy-duty trailer. Features: Long 5/8" diameter locking hitch pin with maximum active length 3-1/2", fits Class III,IV,V hitches with 2", 2.5" and 3" receivers. (Please verify you the size of your hitch and get a suitable hitch pin lock) Constructed from heavy-duty iron and finished with black e-coated to increase the wear resistance and rust resistance. Watertight dust cap can protect the keyhole from water and dirt. A separate spring clip and 2 holes provide additional safety, 2 clip holes one for 2" x 2" receivers another for 2.5" x 2.5" receivers. Rubber O-rings prevent any rattling and hold the hitch pin still. With push-to-lock technology and 1/4-turn lock, make it easy to lock and unlock the hitch lock set. Specifications: Material: Heavy-duty iron & rubber, Finished with black e-coated Color: Black Package Weight: 500g / 17.64ounces Package Size: 290 * 190 * 40mm / 11.42 * 7.48 * 1.57in Note: This product does not fit the bike racks with threaded connection. Installation Method: 1. Open the rubber cover and place the pin into the lock head. 2. Push the lock head to lock the hitch pin. 3. For more safety insert the clip in the hole. 4. Use the key to unlock and remove the safety clip to release the pin lock. Packing List: 1 * 5/8" Hitch Locking Pin 2 * Keys 1 * Steel Spring Clip 5 * Rubber O-rings 1 * 5/8" Hitch Locking Pin 2 * Keys 1 * Steel Spring Clip 5 * Rubber O-rings