3 inch Heavy Duty Casters Load 1500lbs,Lockable Bearing Caster Wheels with Brakes,Swivel Casters for Furniture and Workbench,Set of 4 (Free Screws): Amazon.com: Industrial & Scientific
Swivel Ball Caster Roller Transfers Set of 4 Swivel Ball Castor Furniture Trolley Screw Mounted Round Casters - Walmart.com
Heavy Duty Steel Casters | 6" x 3" Dual Wheel Swivel Caster - 20K Cap - Mapp Caster