... treatment:harden temper Surface treatment:shotblasting Forged and machined universal joint: Material:stainless steel, carbon steel,iron,copper,and so on ... , 2)CNC lathes ,40sets 3)CNC Machining center 3sets 2.ISO 9001-2000 certificated 3.Export to:United stated ,South Korea ,Japan ,etc ... that we can quote our most competitive offer back. universal joint