Duplex BS Standard Roller Chain 1. 40Mn, 45Mn quality alloy steel 2. carbonized harden 3. competitive price Duplex BS Standard Roller Chain Attachment type: A1, K1, SA1, SK1, WA1, WA2, WK1, WK2, WSA1, WSA2, WSK1, WSK2, D3, D5, GK.Special attachment according to customers' drawings.SPECIFICATION:PACKING: Duplex BS Standard Roller Chain Verified Information This information is Verified by Bureau ...