OK5STAR 3 Inch Expanding Stem Caster Wheels Set of 4 for Table Legs, Stainless Table Casters All with Brake Fit 7/8" and 1" Tube ID Leg Adapter Caster: Amazon.com: Industrial & Scientific
Brand New Steelcase Table Legs with Castors (wheels). (4 pole legs per box) | eBay
Regency 34" Galvanized Steel Legs with Casters for Work Tables with Galvanized Legs - 4/Set