Overall float height: 2 inches total glide peak when installed, matches for many small chair casters; This stool workplace chair bell glides can convert office chair with casters into a stationary chair without losing the chair height.Dimension of insert stem: the standard 7/16 x 7/8 inch (11 x 22 mm) grip ring mounting stem to attach to most traditional chair or stool bases, Suitable size can meet your needs; Please measure your size earlier than purchasing.Bell glides size: these bell glides are 2 inch in bottom width and 2 inch total drift height, comparable to maximum small chair casters.Practical design: with strong PU structural glides design, can handle extra weight on maximum of desk chairs, workshop chairs or every other stools, etc., black peak with grey backside also can smooth to check various chairs.WILDLY USED: It can be used as the desk bound castors on wood, metallic and tubular steel chairs, furnishings and other kit to constant them well.Colour: black, grayMaterial: PU, metalSize: about 52mmPackage Contents:5 * Fixed Stationary CastorsOnly the above kit content, other products are not included.Note: Light taking pictures and diverse displays could cause the colour of the object in the photo a little bit diversified from the real thing. The dimension allowed error is +/- 1-3cm.