... resistance&hardness 3.high precision 4.good strength 5.excellent transmission pulley Nantong Runfeng Powder Metallurgy Co., Ltd. is ... used in automobile,motorcycle and many other field.like transmission gear,spur gear,bevel gear,helical gear,sleeve,copper ... sleeve,sleeve bearing, bushing, bush,transmission pulley,timing pulley,structural parts,powder metallurgy parts,nut, ...