... treatment Hardness:HB300~350 or HB380~450 Ningbo yuanda machinery Co., Ltd is a professional manufacturer of cutting edge and end ... cooperaes with a trading company named Ningbo For-Global International Trade Co., Ltd whom suppliers with cutting edges, end bits, bucket ... Note: the above indication is from Ningbo For-Global Intl. Trade Co., Ltd. which is for reference purpose only.Welcome to order ...