Unpolished Tube OD Weld Fittings are used in a wide variety of industrial applications where sanitary finishes are not generally required. VNE’s tumbled finish presents a consistent uniform appearance.VNE’s Unpolished Weld Fittings are offered in nominal tube sizes 1/2" through 12" in T304 and T316L materials. Uniform wall thickness for 1/2" through 3" sizes measure .065 (16 ga). In 4" size, wall thickness measure .083 (14 ga), 6" and 8" .109 (12 ga).