1.Iso9001 certificated 2.Good abrasion resistance&hardness&density 3.High precision 4.Oem offered 5.Sintered bearing bushing ... --sintering--resizing--cleaning--vacuum oiling--packing3.material:steel,copper,steel copper,bronze,alloy.4.produce equipment:200T, ... gear,bevel gear,helical gear,bronze bearing,copper sleeve,sleeve bearing, bushing,bush bearing,pulley,timing pulley,structural parts,powder ...