4 Pack 1.5 Inch Square Tube End Cap Plastic Plugs, 1.5x1.5 Square Tubing Plug, Tube End CapsTubing Post End Cap Suitable for Square Tube Square Plastic Plug, Tubing Post End Cap Square Tubing

Bought these to put on the ends of my Zero grind rail and they fit perfectly. Very secure fit, used hammer to insert. Very pleased with the result.

Used to keep metal legs on Traeger Scout from rusting and scratching up the table. Just a tad too big, but was able to force them in with a hammer. Looks fine though.

Finishes off the gate nicely and easy to install.

The product is a standard 25mm(1”) Square Black Plastic Plug for 1 x 1 tubing. The product fits my tubing, it does the job. I really needed only two pieces. Other similar products are sold in large quantity packages. This was the smallest (12 pieces) quantity package I could find on Amazon. So, if you need only a few 1 x 1 plugs, buy these.

Fitted properly, easy to install, very fast shipping!

didnt fit right

This product fit perfectly left no gaps I would buy this product again. I used on for my sliding gate on the square metal ends to keep the rain out and from getting to my locking mechanism and rusting it out. Once again great product.

I was impressed by how stiff this plastic was. In fact, when I took them out of the package I worried at first that they would be a bear to insert. The retention fins were thin enough where that turned out not to be a problem and they pushed in without excessive force. There is a decent amount of plastic that abuts the tubing end-wall as well. My application was more aesthetic, but i wouldnt be too afraid to put some axial load through them- unlike some of the soft and squishy materials endcaps are often made from.

took some brute force, but got it into a 1 inch square opening. it wont be coming out easily.

It works exactly like I expected it to. No problem at all.