... abrasion resistanc 3.high precision 4.good strength 5.excellent ring and pinion gear Nantong Runfeng Powder Metallurgy Co., Ltd. is ... make the products according to customers' drawings or requirement.7.short deliver time.8.The products we produce are widely used ... and many other field.like transmission gear,spur gear,gear ring,helical gear,sleeve,copper sleeve,sleeve bearing, bushing, bush,pulley ...