●【ANTI-THEFT】 Unlike other hitch pin locks, each lock cylinder is unique and designed by JoyTutus. With solid and heavy-duty No.45 steel construction, adopting a safer zinc alloy lock core and plum blossom keyhole, which can prevent others from towing your trailer away. ●【FITMENT TYPE】 Use a tow receiver lock to ensure the towing safety. The locking hitch pin is compatible with hitch rack, cargo hitch tray, bike rack, hitch ball and tow rope, 5/8" pin with 2-3/4" effective length perfect for Class III/IV 2" hitch receiver tubes.[NOTE: The weight load rating for JoyTutus hitch lock, Class III - up to 5,000 pounds, Class IV - up to 10,000 pounds, Class V - up to 17,000 pounds.] ●【PREMIUM MATERIAL】 The trailer receiver lock uses black electrophoretic painted carbon steel, solid and hard to bend. 360 degree rotating head, easy to handle. All-weather rubber key slot cap keeps the keyhole away from moisture, dust and rust. Updated tubular key hole, zinc alloy lock core. ●【EASY OPERATE DESIGN】 The hitch lock can be easily locked and unlocked with key. For convenience, our lock comes with 2 keys each set. And after locked, you just need to pull the lock head to ensure it is working. ●【PREVENT RATTLING NOISE】 When you are using a trailer hitch, you might run into some issues like rattling and noise. Our trailer hitch lock pin is equipped with 2 rubber O-rings, which can effectively prevent rattling noise caused by shaking during towing.[NOTE: 2 O-Rings can be disassembled, if you find the trailer lock is short, you can remove the rings and re-install the lock.]