... :55CrSi, SWOSC-V,50CrVOEM acceptedwe supplied valve springs for LIFAN.As the biggest manufacturer of spring in FoShan area,you can expect ... springs and wire form, even punch fitting of hardwareUsage:auto,motorcycle,industry,ariculture,mine,furniture,elevator and so onWide range offered ... acceptedCustomised designs are welcome,so send us your specifications now. valve spring