Overall sliding height: 2 inches overall glide height when installed, fits most small chair casters; This sliding office chair stool can convert an office chair with casters to a stationary chair without losing chair height Insert rod dimension: the standard 7 handle ring mounting rod /16 x 7/8 inch (11 x 22 mm) attach to most standard chair or stool bases, suitable size can meet your needs; Please measure your height before purchasing Bell glides size: These bell glides have a bottom width of 2 inches and an overall glide height of 2 inches, similar to most small chair casters Practical design: with strong nylon structural glides, can support more weight on most office chairs, workshop chairs or any other stool etc, the black top with the gray(or black) bottom can also easily match different chairs Protect your floor: bells replacement has soft rubber bottom can better protect your soft floor, and the package includes felt pads which can also provide extra protection on floor surfaces 2 classic colors Easy to match with different chairs, made of PU material, thick and durable, can be an economical replacement of chair wheels. Suitable size The mo Standard 11 x 22 mm pad attaches to most chair or stool bases. Intimate design Matches with felt glides to not only better protect your floor, but also provide people with a safer seat, avoid wheelchair injuries.