the standard 10 x 22 mm grip ring mounting stem to attach to most standard chair or stool bases, Suitable size can meet your needs. Not fit for chairs. glides replacement has hard plastic bottom can protect your soft floor better, and the package includes felt pads also can provide an extra protection on floor Chair slides that turn office chairs with casters into stationary chairs (gaming chairs, desk chairs), prevent slipping and work more efficiently, provide a seat for those who have difficulty in and out of the chair when the chair rises from a table or desk. these bell glides are 2 inch in bottom width and 1.4 inch overall glide height, similar to most small chair casters; The weight of each glide is 110 lbs, 5 pieces glides support 550 lbs in total with solid nylon structural glides design, can handle more weight on most of desk chairs, workshop chairs or any other stools, etc., black color also can easy to match different chairs; The plastic bottom is not easy to slide