100mm Replacement Castor for Service Trolleys (S4722) - Richmond Wheel & Castor Co
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
Mild Steel PU Trolley Wheel Set 6" x 2" ( 2 - Fixe & 2 - Moveable ), For Movement
Caster Wheels: Types, Applications, Benefits, and Manufacturing