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

Great item!

Fit well

I bought the tube caps for my trailer but I really needed 1 1/2 caps which I ordered. They seem to be good caps.

Not as described. Will slide through a 1 square tube. at best they may fit a 3/4 tube.

Perfect fit and well made

Fit like a glove

These fit nicely into 1 aluminium square tube from home depot. I used them on a roof rack project to keep water and wind out of the rails, and they work great!

fit great

Just built a carport with left over metal and adding these inserts gives it that completed look. PLUS it kept Wasps from building nests in it this summer. There is no reason to not get these for your project except for being just a CHEAP tight wad.

Perfect fit.