... spring leaf spring for heavy duty truck, standard leaf spring: Howo system,Styer system, 6X4,6X2,4X2 ... ,8X2 and more.our leaf spring use for heavy duty truck, trailer,semi-trailer.Use the raw metal usually: SUP7, ... and email us.we also welcome you supply us your special draw, it's accept.for our business, please email ... your require and company details.thank you very much. truck part, leaf spring