The SXTC1 (Fits couplers with up to a 7/8" span), SXTC2 (Fits couplers with up to a 2 1/2" span) & SXTC3 (Fits couplers with up to a 3 1/2" span) features 100% stainless steel. Provides additional security for your camper, boat or trailer by securing the coupler on your trailer tongue. Also secures trailer door latches, cargo boxes and other types of doors. Features patented 1/4 turn technology that cannot be false locked. * 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 * 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. * LIFETIME WARRANTY