Trimax T2 Premium 1/2" Keyed Receiver Locking Pin Made of high quality, forged chrome plated, Machined hardened steel 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 1/2" pin fits all Class II receiver hitches 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 Includes 2 keys 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.