5/16 ISO G43 High Test Marine Anchor Chain 144 &micro;m Micron Thick Hot Dipped Galvanized NACM Premium Quality ISO G43 High Test Hot Dipped Galvanized Anchor Chain 144 m thick galvanization as recommended by Practical Sailor Complies with NACM Chain size - 5/16" MarineNow has sold over 150,000 feet of chain