Designed with PVC-coated galvanized steel wire to keep truck box doors from over-extending. Made from aircraft grade materials for long lasting, reliable performance. Universal design with two swagged eyelets fits most drop door and swing door truck boxes. Made in the USA. Universal design with two swagged eyelets fits most drop door and swing door truck boxes. Designed with 3/32 in. PVC-coated galvanized steel wire, Buyers Products Door Lanyard is built to withstand incredible stress in keeping your truck box door from over-extending. It fits most drop door and swing door truck boxes and is a standard feature on Buyers Products state-of-the-art drop door truck boxes. The lanyard is made from aircraft grade materials for long-lasting, reliable performance. Custom sizes are available by quote. Please contact Customer Service for further information.