Square Plastic Tube Expandable Inserts or Plastic Square Tube Expandable Inserts, Plastic Expandable Inserts for Square Tube, Expanding Tube Inserts, Tubular Expanders and Expandable Sockets with the Expansion mechanism being driven by the Nut. Simply screw into these Bungs with a standard metric thread and the screwing motion will expand the insert outwards, thus gripping the Tube from the Inside and the dimensions listed are exactly as you would buy the tube, so it's outside dims x wall thickness.
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