Added a hole and clip to anti rattle hitch pin for extra safety - never worry about losing the if the locking system gets lost or damaged. Simple push-to-lock /4 key turns to unlock mechanism. Rubber for extra protection against dirt and grime. Features - Color: Silver. - Material: Iron and zinc alloy. - Size: 20.00 x 3.20 x 3.20cm/ 7.86 x 1.26 x 1.26 inch. - As long as you couple these two parts with the hitch and give them a push, they will be automatically locked. - This is because this lock has a push to lock mechanism that makes this product extremely easy to use. - It does an incredible jobs at reducing the risk of rust and corrosion by being made from weather resistant material. - The pin lock made of heavy-duty iron and zinc alloy is durably made and does so without being outrageously heavy. - The pin fits most receivers of cargo carrier, bike rack tray, hitch ball mount, boat trailer truck, and RV. Package list: 1 x lock 2 x keys