We have kitchen chairs that sit on a ceramic tile floor. The legs are rectangular iron tubes about 1/2 x 1 inch and are hollow. They are covered in silicone inserts that wear out quickly and are very noisy when scraped across the floor. I was about to give up when I found some of these round caps. Leftovers from another project and tried to put them on metal legs. To my surprise, they stretch well at the end of the leg and stay in place. They are quiet and don't ruin the floor. The only downside is that they don't slip and we have to lift the chairs a little to move them.
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