This is a quality marine grade stainless steel (AISI 316) chain specifically cut for anchor chain. The link size is 8mm or 5/16" equivalent. Included are two oversized marine grade stainless steel (AISI 316) anchor shackles. Each shackle is 10mm (3/8"). The total length of chain is 20' measured before the shackles are added. The chain link size is in the European specification style of 8mm and the shackle is in the US style of 3/8" (for the shackle size). 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.