... alloy steel 2. carbonized harden 3. competitive price Duplex BS Standard Roller Chain Attachment type: A1, K1, SA1, SK1, WA1, ... attachment according to customers' drawings.SPECIFICATION:PACKING: Duplex BS Standard Roller Chain Verified Information This information is Verified by Bureau ... ,500 0.32 Domestic Market USD 11,428,570 63.88 Production Machinery: Machine Name Brand & Model No. Quantity Number ...