This is for one (1) quality marine grade stainless steel (AISI 316) 3" hinge. Each hinge is stamped 316 and laser etched 3 with the makers mark. The hinges are marked in the US specification style of 3". Not to be used for overhead lifting. AISI 316 stainless is a premium grade of stainless and is considered by many to be best in class. 316 stainless is corrosion resistant and very durable even in the harshest of conditions for a long service life.