Trimax TM33 5/8" Receiver and 3-1/2" Span Coupler Lock Keyed alike set includes one T3 5/8" Receiver Lock and one TC3 3.5" Coupler 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 Chrome finish Fits class III, IV and V receiver hitches