This 316 Stainless Steel Windlass Anchor Chain complies fully with DIN 766. This is for a six (6) foot length of chain and includes two quality shackles. This is a quality, high grade, marine stainless steel (AISI 316) DIN766 chain suitable for use in a windlass as anchor chain or other marine applications where high corrosion resistance is desired. Superb for anchor chain and general heavy duty work in a marine or chemically harsh environment. This chain will fit many standard windlasses. Please consult your windlass manufacturer model manual for the ideal specification for your windlass. The 3 important figures for smooth running on your windlass is the Diameter (DIA), Inside Length (IL) and Outside Width (OW). More details are in the spec table below, this chain is 6*18.5*20 (DIA*IL*OW). As DIN766 is a metric specification we list the specs in mm, the imperial equivalent of this chain is 1/4"*0.73"*0.78". The link size is 6mm or 1/4" imperial equivalent. Every 3 feet links are hallmarked and stamped with 316.