Press-fit plugs for round tubing unthreaded—the closed steel cap designed solely for sealing round tube ends with diameters from 26.9 to 60.3 mm. Available in a slightly curved (Series 166) and flat design (Series 167), for wall thicknesses from 1.8 to 3.5 mm. Raw/ungalvanized; also available galvanised for Ø 33.7 and 42.4 mm. Supplemented by steel caps with a 12.3 mm hole.