Trailer Hitch Lock 5/8" Diameter Black Heavy Duty Tow Locking Hitch Pin Lock for RV Truck Trailer Tow Receiver Universal Features: 5/8inch extra long pin lock pin for most connections 2 pinch holes, one for 2inch x 2inch receivers and one for 2.5inch x 2.5inch receivers Made of rugged material with black electronic coating and traction of up to 20,000 lbs. 5 rubber O-rings prevent rattles 2 keys, one for use and one for backup How to install: 1. Open the rubber cover and put the pin into the lock 2. Push the lock to lock the hook pin. 3. For added safety, insert the clip into the hole. 4. Use the key to unlock and remove the safety clip to loosen the cost lock. Specification: Weight: 1.06 lbs / 482 g colour:Black Material:stainless steel Size: 5/8inch hook lock Package Contents: 1*5/8inch hook lock pin 1* spring clip 2* tubular key 5* rubber O-ring Tips: 1. Before buying, please confirm all the dimensions of the hook to better install the hook lock pin. 2. Different brand hooks may have a different hook size. Please adjust the number of O-rings or remove the O-ring to fit the receiver. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.