If you have metal sled base chairs that are ruining your floors then you should look at this Flexi-Felt model designed specifically to fit tubing of 1/2 inch (12mm).
The 6015D Flexi-Felt model is made of transparent and very durable plastic.
Once the unit is installed properly it is very difficult, almost impossible, to remove. Our sled base models offer unsurpassed floor protection with the largest surface contact area on the market
Our patent pending antiroll system is guaranteed to keep the Flexi-Felt® well aligned
The product is guaranteed for 5 years
After trying different felt patches for my sled base chairs these seem to fit the bill so far. Put micro plaster tape on legs to stop twisting and easily clipped on protectors. I have Amtico flooring and chair bottoms scraped floor. Fingers crossed for these protectors as I don't want a rug to put chairs on! Watch this space 1st July 2019