[Universal Size]: These stool or office chair glides have a standard 7/16 inch x 7/8 inch (11 mm x 22 mm) grip ring stem for mounting 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-functional Glides]: Durable solid NYLON construction to handle more weight on any desk, workshop chairs, cabinets. The fixed glides are a choice for office and home decor. [Quick Installation]: Our replacement glides feature a new stem design, no need, just pull out your old casters and insert these. Color: black Material: Metal + plastic Package Contents: 5 * glides 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.