... high polished3.Name:Bullet End Plug,forged pipe fittings4.specification:7/8'' Casting: investment ... steel ,alloy steel, heat resistant steel ,tool steel ,brass and aluminum ,according to DIN ... : cast, machining, turning, milling, drilling, thread cutting.Surface treatment: glass rays electrolytic polishing, coating ... inspection up to 200bars ,mechanical values for tensile strength. ,yield stress ,notched ...