As a result of using this product, I found that it was completely inadequate. It didn't improve the functionality of my castors at all and was a waste of my money. The only positive thing was that it arrived quickly after I bought it online. Unfortunately, that was a minor consolation for a useless product. It's disappointing that this was marketed as an accessory for castors and falls so short of quality. I would not recommend this product to any buyers in the Industrial and Scientific Casters category.