3) Marine anchor chain, protective chain, B-type chain, C-type chain, CB*21-83 marine small chain, German standard DIN766 DIN763 DIN764 DIN5685 Japanese standard chain American standard chain, specifications can be customized according to the drawings (4) The rattan explosion-proof chain and anti-static chain are made of pure H95, H80, H65 brass chain, with complete specifications of 3mm-8mm GB 3473-1983 GB CB/T291-1999 Marine tongue latch 316 bolt Type B Type A Model: GB3473-83 Marine tongue latch Executive standard: National standard of the People's Republic of China Product type on this page: Type A Type B Marine Tongue Latch Material: 304 316 316L 310S stainless steel Material on this page: 316 stainless steel B16*45 Specification: 5~20mm