Overall glide height: 2 inches overall glide height when installed, fits for most small chair casters; This stool office chair 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 standard chair or stool bases, Suitable size can meet your needs; Please measure your size before purchasing. glides size: these glides are 2 inch in bottom width and 2 inch overall glide height, similar to most small chair casters. Practical design: with solid PU structural glides design, can handle more weight on most of desk chairs, workshop chairs or any other stools, etc., black top with gray bottom also can easy to match different chairs. WILDLY USED: It can be used as the stationary castors on wood, metal and tubular metal chairs, furniture and other equipment to fixed them well. Colour: black, gray Material: PU, metal Size: about 52mm Package Contents: 15 x Fixed Stationary Castors Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.