2Inch (50mm) Square Plastic Hole Plugs Insert (20 Pack), Heavy Duty Black Hardware Plugs and Unistrut End Caps for Square Tubing, Glide Insert for Pipe Post, Chairs and Furniture by Prescott Plastics

Perfect fit

Very good clean look. Fit a variety of 1 square tube thicknesses too.

Fit perfectly!!

Worked just like it should

Very easy to install and sealed our aluminum tubing perfectly.

Perfect fit for 1by 1 opening on the top of our black outside rail.

Easy replacement, but dont see them lasting being so thin. Look around and get what you need.

Worked great just what I needed!

Easy to install. It may look like it won’t fit on thicker gauge metal but it will. Just line it up and tap in with a rubber mallet.

Worked as advertised. Needed a modest amount of persuasion to fit, but you would expect that. I want a sung fit so that it doesnt pop out like the end its replacing.