... hardness 3.high precision 4.good strength 5.excellent timing belt pulley Nantong Runfeng Powder Metallurgy Co., Ltd. is specializing ... vacuum oiling--packing3.material:steel,copper,steel copper,bronze,alloy.4.produce equipment:200T,100T,60T,25T,15T,10T ... sleeve bearing, bushing, bush,pulley,timing pulley,structural parts,powder metallurgy parts,nut,auto parts,rotor and stator, timing belt pulley etc.