This is for one (1) quality marine grade stainless steel (AISI 316) anchor swivel with jaw and jaw. Each swivel is stamped 316 and 16 showing both the grade of 316 and the size 16mm. The swivels are marked in the metric specification style of 16mm. The Imperial equivalent is generally considered to be 5/8". 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.