This is for one (1) quality marine grade stainless steel (AISI 316) Bow Shackle with Locking Pin. These shackles are made in the US specification style of 1/4" (for the shackle size). The Metric equivalent is generally considered to be 6mm. This shackle features a locking pin, which does not detach from the shackle if it becomes unscrewed during use. Breaking Load = 3740lbs. 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.