Stainless Steel 316 D Shackle 3/16" (5mm) Breaking Load 2200lbs Marine Grade Stainless Forged for greater strength Corrosion and rust resistant for a long service life This is for five (5) quality marine grade stainless steel (AISI 316) D shackles. Each shackle is stamped 316 and laser etched 3/16". The shackles are marked in the US specification style of 3/16" (for the shackle size). The Metric equivalent is generally considered to be 5mm. This is a forged shackle, which for load bearing applications is better than a cast shackle. 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. WLL = 550lbs BL = 2200lbs