We have an old office chair which now showed signs of disintegration on the rollers after many years. Since our foundation is solid wood flooring, we need to look for long if there are the right roles. also important is the measure of the diameter of the axle, here I would have 1cm measured with folding ruler, but it is to check with a caliper 1,1cm been. So accurate measurement is important. Roles were after 2 days there, the old easy to move out of the recording, tuck the new, finished. Without load the chair does not roll with load it rolls even when compared to the old very easily. So a smooth buy recommendation.