I bought these casters to attach to the bottom of a wooden wine box that I use to store things in my living room. They worked great initially. They glided smoothly and silently across the wooden floor. I used 6 casters to carry a total of 15-20lbs which is well within the stated limit. Unfortunately, after just a few weeks, they began to fall apart. The wheels stopped turning and got stuck; and I suspect that the hard plastic may have scratched my parquet floor. After 4 months I removed the rollers and replaced them with a new set from another company.