A series roller chains 1. material: alloy steel 2. color : blue, black, yellow and natural A series roller chainsSpecification: ... -1, 48A-1.2. Duplex: 04C-2, 06C-2, 085-2, 08A-2, 10A-2, 12A-2, 16A-2, 20A-2, 24A-2, 28A-2, 32A-2, 36A-2, 40A-2, 48A-2.3. Triplex:04C ...