This is for one (1) quality marine grade stainless steel (AISI 316) anchor swivel with eye and jaw. Each swivel is stamped 316 and 6 showing both the grade of 316 and the size 6mm. The swivels are marked in the metric specification style of 6mm. The Imperial equivalent is generally considered to be 1/4". 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.