[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 to attach to most standard chair or stool bases, please measure yours 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 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 . [Quick install]: replacement glided feature a new design, no tools needed, simply pull your old wheels out andthese in. Colour:black Material:Metal + plastic Package Contents: 5 * glides Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.