2" Replacement Office Chair Caster Wheels - (Set of 5) - S3253 Set of 5 standard 2" replacement office chair casters Fits into most standard chair bases with its standard 7/16" x 7/8" (11mm x 22mm) wire grip ring mounting stem Standard hard nylon plastic wheels - Ideal for use on carpet and plastic chair mats Looks great with many black plastic, steel, or aluminum chair bases Black