Chain,Standard or non-standard , A series ,B series. From ASA35-ASA240,06B-48B,Simplex,Duplex,Triplex,or customized... Chain,manufactured by Hangzhou Vision Chain Transmission CO.,LTD.The history is more than ten years , has all kinds of chains, Standard or Non-standard,got ISO9001:2000,ISO1401:2004,The quality has the guaranteed.Welcome your inquiry ! Chian