4 Pack- 2" Round Black Plastic Tubing Plug, 2 Inch End Cap - Steel Furniture Pipe Tube Cover Insert | Fencing Post - End Caps for Fitness Equipment (14-20 Ga 1.840"-1.930" ID) 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.