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 3/4 inch (20mm).
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 5years