This is for one marine grade stainless steel (AISI 316) bow shackle. Each shackle is stamped 316. The shackles are marked in the US specification style. This is a forged shackle, which for load bearing applications is better than a cast shackle. 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