24" Replacement Office Task Chair or Stool Base - Polished Aluminum Top - S4050 24" wide replacement chair or stool base Standard 2" (50mm) center hole to receive standard chair gas cylinders Standard 7/16"x7/8" (11mm x 25mm) caster socket holes to receive standard caster mounting stems 2.5" overall height of base Polished aluminum top with un-painted underside