Heavy Duty Office Chair Casters 2-3/8" (60mm) Soft Hardwood Floor Safe Wheels Set of 5 Thermoplastic elastomer rubber wheels - Safe for ALL floors Non-marking and non-marring Large size 2-3/8" (60mm) 100 pound capacity per caster 2-5/8" Mounting Height Grip ring stem size: 7/16" diameter; 7/8" length