... &hardness&density 3.high precision 4.oem offered 5.sprocket Nantong Runfeng Powder Metallurgy Co., Ltd. is specializing ... in automobile,motorcycle and many other field.like transmission gear,spur gear,bevel gear,helical gear,sprocket,sleeve,copper sleeve ... ,sleeve bearing, bushing, bush,pulley,timing pulley,structural parts,powder metallurgy parts,nut,auto parts,rotor and ...