(Pack of 8) - 2" Round Black Plastic Tubing Plug (14 -20 Ga 1.840"-1.930" ID), 2 Inch End Cap - Steel Furniture Pipe Tube Cover Insert | Fencing Post - End Caps for Fitness Equipment For Fencing Posts, Furniture End Caps, Fitness Equipment End Caps Flexible ridges snugly hold these plugs in place. For Unthreaded Surface Type with Stright Profile Maximum Temperature 150 ' F.