Master Lock 387 Trailer Lock Master Lock 387 Trailer Lock Also known as King Pin Lock is made for Semi-Trailers, RV and Fifth Wheel Trailer. Product Details: The Master Lock 387 High Security King Pin Lock secures the king pin of semi-trailers, RVs and other fifth wheel trailers to prevent theft and deter break-in’s. Including an integrated padlock (No. 5), this locking device renders bolt cutters useless and the high-grade aluminium is lightweight while providing high security. Product Features: Secures the king pin of semi-trailers, RVs and other fifth wheel trailers. Renders bolt cutters useless. High grade aluminium is lightweight while providing high security. High visibility red body and durable flag alert drivers that lock is attached. Includes an integrated No 5. lock with all of its security and keying flexibility.
