National Surface Mount Bronze Bi-Fold Door Hinge is a durable and convenient solution designed specifically for bi-fold doors that are at least 1 inch thick. This 3-inch non-mortise hinge features a non-removable tight, non-rising pin, ensuring reliable performance and security. Its surface mount design eliminates the need for mortising, making installation quick and easy. I for enhancing the functionality and appearance of your bi-fold doors, this hinge combines practicality with a bronze finish for a classic look. Model Number: V530