... Good abrasion resistance&hardness&density 3.High precision 4.Oem offered 5.Sintered steel sleeve Nantong Runfeng Powder Metallurgy Co., Ltd. ... oiling--packing3.material:steel,copper,steel copper,bronze,alloy.4.produce equipment:200T,100T,60T,25T,15T,10T,6T, ... gear,spur gear,bevel gear,helical gear,bronze bearing,copper sleeve,sleeve bearing, bushing,bush bearing,pulley,timing pulley,structural parts, ...