Product Info Catalog Hardware Builders Hardware Hinges Mortise Spring Hinge, Brass, 3.5 x 3.5-In. Mortise Spring Hinge, Brass, 3.5 x 3.5-In. Request a Quote UPC: 38613184558 SKU: 551473 Model Number: N184-556 3-1/2-Inch x 3-1/2", Dull Brass Finish, Mortise Spring Hinge, With Screws, 1 Hinge Per Pack.