This industrial grade detachable chain is manufactured in America by Rexnord and is primarily used on older models of agricultural machinery such as spreaders or planters. The chain comes in 10 ft. pre-packaged rolls, but can be simply detached and re-attached by the link to fit your specific needs. The size is stamped on each individual link and should also be on any detachable chain you may be connecting to or looking to replace. We no longer intend to carry detachable chain in regular stock, so once these rolls are sold out, this item will only be available through special order.