Triplex Roller chain link, 1.Materials: carbon steel, stainless steel 2.Colors:blue,black 3.Certification: ISO9001:2000 Triplex roller chain ... ,72B-1. 2. Duplex: 05B-2, 06B-2, 08B-2, 10B-2, 12B-2, 16B-2, 20B-2, 24B-2, 28B-2, 32B-2, 40B-2, 48B-2, 56B-2, 64B-2, 72B-2. 3. Triplex ...