... special chains, such as A or B series chains, roller chains, driving chains, conveyor chains, dragging chains, agricultural ... , sprockets, wheels, gears and so on; 2.Chain material:40MN,A3,SS304,plastic etc.3.Standard:ISO/DIN ... and high strength 9.pre-stretched and anti-fatigue10.produce as your sample or drawing 11.sound quality,reasonable ... you in the near future. industrial transmission roller chain