National Hardware 4" Oil Rubbed Bronze Square Door Hinge, (3-Pack) features a heavy-gauge cold-rolled steel construction for enhanced strength and durability. This square corner hinge includes a flush pin that provides a clean, finished appearance. Designed with a 5-knuckle, full mortise style, it ensures a secure fit and smooth operation. The screw holes are countersunk for a neat installation, and the removable pin allows for easy installation or removal of doors, making it a practical choice for various door applications. Model Number: N830-402