Heavy Duty Casters for Rack - Caster Kit - Casters, Keys and Miscellaneous | Server Rack Accessories | StarTech.com
Amazon.com: Corner Casters Set of 4 Heavy Duty Wheels - Black Phenolic Thermo Plastic Wheels w/ Steel Bracket – Pneumatic Caster Wheels for Furniture Cabinet, Trolley, & More – Easy to Install
PRITEK 5 inch Heavy Duty Caster Wheels No Noise Swivel Plate Casters with Brake Lock Top Plate and Wheel Fit for Table Cabinet Shelves Industrial Trailer (Bearing 1400lbs, Set of 4): Amazon.com: