This is for two (2) quality marine grade stainless steel (AISI 316) wire rope thimble in heavy duty. Each thimble is stamped 316. For wire rope size of 3/16". 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.