Trimax T-3BLACK Premium 5/8" Key Receiver Lock Rugged BLACK epoxy powder coat Made of high quality, forged hardened steel with rugged black epoxy powder coat O-Ring seal and water tight cap help seal out dirt and corrosion 1/4 turn locks and unlocks head Lock can NOT "pop" open Lock can NOT be false locked The 5/8" pin fits all Class III, IV and V receiver hitches, fits up to a 2-3/4 span O-ring keeps water, grime and dirt out of locking mechanism to ensure years of use Protective rubber cap protects keyhole from water, grime and dirt Strongest locking pin on the market Type A key which is a spring loaded, 7 pin, high security key. Resists attempted drill outs. Rugged and durable, the key will not bend or break.