Overall go with the flow height: 2 inches overall glide height when installed, suits for many small chair casters; This stool workplace chair bell glides can convert workplace chair with casters into a desk bound chair with out wasting 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 before purchasing. Bell glides size: those bell glides are 2 inch in bottom width and a couple of inch overall glide height, comparable to maximum small chair casters. Practical design: with stable PU structural glides design, can handle extra weight on most of desk chairs, workshop chairs or some other stools, etc., black top with grey backside also can easy to match assorted chairs. WILDLY USED: It can be utilized because the desk bound castors on wood, metal and tubular metallic chairs, furniture and other package to fixed them well. Colour: black, gray Material: PU, metal Size: about 52mm Package Contents: 5 * Fixed Stationary Castors Only the above kit content, other products should not included. Note: Light capturing and varied displays can cause the color of the thing in the photo a bit assorted from the genuine thing. The dimension allowed error is +/- 1-3cm.