Colson Polyurethane Heavy Duty Total Lock Swivel Caster 8" x 2" (1000 LBS Cap)
D&L 4 Inch Plate Swivel Casters Wheels 1800lbs Heavy Duty Casters with Brake Polyurethane Dual Locking Casters Set of 4 Red DL-I4-001: Amazon.com: Industrial & Scientific
Moogiitools 5 inch Swivel Caster Wheels with Dual Locking, Heavy Duty of 2400lbs, Premium Polyurethane No Noise Wheels for Furniture and Cart Set of 4(Free Bolts and Nuts): Amazon.com: Industrial & Scientific