This is for one (1) quality marine grade stainless steel (AISI 316) anchor swivel with eye and eye 4mm. The Imperial equivalent is generally considered to be 5/32". 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.