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.