This is for one (1) quality marine grade stainless steel (AISI 316) S Hook or Cunningham hook. Each hook is stamped 316. The hooks are 6mm or 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 for a long service life.