... Thickness: 0.4-0.7mm 3)Width:4-8mm Starter spring/Springs for starter assy of engines1) Material: 62Si2MnA2) Thickness: 0 ... a professional manufacturer specialized in producing all classes of springs for Industrial machine,(ie. garden hose reels, balancer, Retractable ... oil , electrical machine ,start-up machine,etc.),constant force spring for door ,windows ,electric fans ,machines of lift and down. ...