[Universal size]:This Stool or office chair foot glides are standard 7/16 inch x 7/8 inch (11-mm x 22mm)grip ring mounting stem to attach to standard chair or stool bases, please measure yours before ordering.[Fixed and strong]: The stationary casters can be used on wood, metal and tubular metal chairs, furniture and other equipment, per glide as a set of 5 supports 550 lbs.[Multi-function glides]: Durable solid NYLON structural glide design to handle more weight on any of the desk, workshop chairs, cabinet. The fixed glides chair casters are an choice for office and home furnishings.[Quick install]: Our replacement gli feature a new stem design, no nee, simply pull your old wheels out andthese in.Colour:blackMaterial:Metal + plasticPackage Contents:5 * glidesOnly the above package content, other products are not inclu.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.