4" Plate Caster Wheels Set of 4 1800LB with Screw Safety Dual Locking and Polyurethane Foam No Noise Wheels,Heavy Duty - 450 Lbs Per Caster: Amazon.com: Industrial & Scientific
8" Casters Set of 4 Heavy Duty Plate Casters 8 Inch Swivel Industrial Rubber Wheels for Cart Furniture and Workbench Locking Outdoor Dolly Castors Replacement Load 3000Lbs (Free Bolts Nuts and Screws):
Amazon.com: GBL - 6'' Metal Casters Wheels with 2 Breaks + Screws - up to 2820Lbs - Set of 4 Heavy Duty Steel Castor Wheels - Industrial Dolly Wheels for Tool Box,
POWERTEC Swivel Heavy-Duty Industrial Caster, 8 in. Wheel Dia 17051 - The Home Depot
Hamilton Caster - Manufacturer of Heavy Duty Industrial Casters and Industrial Wheels > Casters > Heavy Duty Dual Wheel
Vergo Industrial 400 lb Capacity Heavy Duty Folding Hand Truck Dolly Cart with Telescoping Handle, Aluminum Foldable Cart with Wheels - Walmart.com