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

We are using these for plugs in the bottom of pipe organ pipes. We drilled them to accept 1/2 brass nipples and the plastic held tight without cracking.

Had to custom trim my power racks uprights to fit in the garage due to overhead storage. Though I sealed with rust-oleum, the edges were still left very sharp. These plugs were a perfect finishing touch to the upright, plugging both the edges, while adding a missing detail that looks like it shouldve been included from the very beginning...

Good product. Fit perfectly. Poor Quality Control. I paid for a 20 packet but only received 19, but I didnt realize until after I had started using them. So minus 2 stars

I bought the 1” for square tubes for a truck step. Now I will be buying other sizes for various other projects. These stay put and are not easily removed.

Bought these to seal up the square tube used as a spacer to raise truck toolbox, worked perfectly.

Great product. The schematics and details provided by The manufacturer in the Amazon description sealed the deal! Bill

Simple and great

It fit perfectly, good quality, and good price.

Don’t fit quite as tight as I had hoped but it may be due to the age of my lawn chairs.