Rolland Extra Large Office Chair Caster - 60mm Wheel - 7/16"(11mm) Stem - Fit Most Herman Miller Aeron High mobility caster easily glides through carpet floor 11mm (7/16") stem diameter - Compatible w/ most office chairs in U.S.A. Maximum Weight Rating: 120lb/wheel. Each package contains five (5) wheels. Easy pull and snap installation Non-OEM Fits Herman Miller Aeron chairs