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 Anti-wrapped cover: other materials to avoid winding wheel axle and the bracket and the gap, so that the wheels turn freely. 

 Seal: avoid turning a single wheel bearing into the bearing or dust, to maintain its lubricity, to facilitate rotation. 

 Steering lock: spring-latch locks through the steering bearings (four or two locking), Locking Caster can be fixed casters. 

 Shopping cart casters furniture casters polyurethane core single wheel braking casters: On the surface of the wheel or tire on the sleeve, hand or foot operated braking device. 

 Full brake: you can lock the wheels turning and braking can be fixed installations. 

 Brackets: Install the following means of transport can make it in a fixed location on the device. 

 Others: steering arm, lever, rubber fender, locking pads and other parts with a specific purpose. Shopping cart casters furniture casters core polyurethane casters