Press-fit plugs for round tubing with M8 internal thread—seal round tube ends from Ø 33.7 to 60.3 mm and simultaneously accommodate attachments. Balls, eyelets, or Rounds can be screwed in directly. Available in a slightly curved (Series 166) and flat design (Series 167), for wall thicknesses from 1.8 to 3.5 mm, raw/ungalvanized.