This is for one (1) quality marine grade stainless steel (AISI 316) quick link 3/8". Each quick link is stamped 316 and laser etched with size and and the makers mark. The quick links are marked in the US specification style of 3/8". The metric equivalent is generally considered to be 10mm. 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 = 19800lbs