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The BLOCKHEAD Trailer Coupler Lock for unattended trailers features high tech materials that redefine the traditional lip-engaging coupler lock. Extruded, tempered aluminum body provides superior strength-to-weight ratio, a distinctive look and great value. Simple, rugged push-button lock mechanism. Durable, automotive exterior grade powder coat finish. Includes two double-sided, automotive-style keys. Shuttered key opening prevents clogging and freezing.