Detailed Product Description Oil field chains 1, Good quality: we all use good material with alloy steel, ... ,GB,BS,DIN and JIS standards2, Specifications:1)simplex:80-1,100-1,120-1,140-1,160-1,200-12)duplex:80-2,100-2,120 ... -2,140-2,160-2,200-23)so on3 ...