This is for one (1) quality marine grade stainless steel (AISI 316) spring hook long type with eyelet 5/16". Each spring hook is stamped 316. The eyelet is welded into place and non-removable. The Metric equivalent is generally considered to be 8mm. 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. Breaking Load = 801lbs