National catalog model No. V279. The heavy-duty 3-1/2" gate hinge set automatically closes gates up to 50 lb. Meets ANSI/BHMA cycle test (100K) requirements. Patented bearing design eliminates metal-to-metal contact for smooth, quiet operation. Patented ratchet adjustment. Includes 1 spring hinge and 1 standard hinge. Made of steel. 1 set. Carded.