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If you need heavy duty casters, you are probably going to stay away from plastic. It just isn’t as solid as metal is. On many casters, the wheels themselves might be plastic, or the brake mechanism, or both. When all parts are made of metal, except for the rubber wheels, of course, you are more likely to have a caster that will support bigger loads and last a long time.
Heavy duty locking casters:
Heavy duty locking casters pictured: 4″ Heavy Duty Toolbox Caster Set with Polyolefin Wheels – 500 Lbs Capacity per Caster by Service Caster
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