This office chair base replacement kit is designed to refresh worn-out office seating, constructed with sturdy metal that resists breakage and rust while delivering stable support for up to 2500 lbs. of load. The included casters are made of shock-absorbing polyurethane, enabling smooth, quiet 360° rolling that won't scuff or damage hardwood floors or carpets. With a 28 in. Dia base, standard 2 in. center hole, and 11mm x 22mm universal caster sockets, this kit fits most standard office chairs, though users should measure their cylinder's base diameter before purchasing. The set offers both sliding casters and bell glides, letting you switch between a rolling or fixed base setup to suit your workspace needs, whether for a home study or professional office environment.