... /designs and research into new process to produce parts efficiently. Besides basic strengths , we ... Invar,steel, stainless steel, aluminum, brass, alloy... Finish: heat treated, oxided, plated, blastedServiceMachining workMaterialsteel, stainless steel, Invar, carbon steel, free cutting steel, ... is offered by ISO certified manufacturer - visionseal co.,ltdQC:Strict quality control for machining work ...