(Pack of 10) 1-1/2" Round Cap Plugs | (14 - 20 Ga 1.34" - 1.43" ID) 1.5 Inch End Caps - Steel Furniture Pipe Tube Cover Inserts | Fencing Post Slides - End Caps for Fitness Eqpt | by SBD For Fencing Posts, Furniture End Caps, Fitness Equipment End Caps Flexible ridges snugly hold these plugs in place. For Unthreaded Surface Type with straight Profile Maximum Temperature 150 ' F.