Coupler lock is a premium lock constructed with an aluminum body and heavy-duty steel lock bar. Bright, deterrent yellow color is durable, highly visible, and an essential accessory to all types of trailers. Easy-to-install lock resists picking, prying and drill outs. Guards against truck or trailer towaway theft in storage. Passed QC product quality certification Enhanced Lock Cylinder. The lock core adopts anti-rust technology to protect the lock core from rain, dust and sand, more durable. To make the tow ball coupler lock more robust, we upgrade more complex locks and thicker keys. This makes it impossible to crack the lock and increases the toughness of the key. Easy to install lock in seconds, in case of picking, prying and drill outs. The trailer coupler lock is adjustable with 11 locking positions and fits 1-7/8”, 2”, and 2-5/16" couplers. This coupler helps you achieve your family travel goals and puts your mind at ease with its complete line of towing security products. Ergonomically designed for convenience and versatility in safety and security, you can rest easy knowing your connections and investments are secure.