This is for one (1) quality marine grade stainless steel (AISI 316) bow shackle with hexagonal sink pin. The hex pin requires a 12mm hex key or hex wrench (Allen key or Allen wrench) to be tightened correctly. Each shackle is stamped 316 and the makers mark. The shackles are marked in the imperial specification style of 1/2" (for the shackle size). The metric equivalent is generally considered to be 12mm. 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.
