There are several different industry standard sizes of THE ISO 1704 Modified Offshore Mooring Studless Chain, each of them suitable for different applications. The most common smaller sizes start at 30 and end at 64 mm, while the medium sizes usually start at 66 mm up to 111 mm. For heavier duty applications the large sizes of the Offshore Studlink Chain can begin at 114 mm and can end up with the diameter of 180 mm.