[Universal Size]: These stool or office chair glides have a standard 7/16" x 7/8" (11mm x 22mm) mounting ring for attaching to standard stool or bar stool bases, please measure yours before ordering. [Solid & Strong]: The stationary casters can be used on wooden, metal and tubular metal chairs, furniture and other equipment, each glide as a set of 5 supports 250 lbs. [Multifunctional Glides]: Solid and durable NYLON structural glide design to hold more weight on desks, shop chairs, cabinets. The stationary glides are a good choice for office and home decoration. [Quick Installation]: Our replacement glides feature a new spindle design, no tools required, just pull out your old wheels and insert them. Colour: Black Material: Metal + Plastic Package Contents: 5 * Glides Only the above package content, other products are not included. Note: Light reflections and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The measurement allowed error is +/- 1-3cm.