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A roller dolly is a low profile dolly with high loading capacity. It is usually used to move, shift, and/or position extremely heavy loads. Some roller dollies can swivel for making tight turns. Some are steerable and is able to move heavy loads with precision. Most roller dollies have low profile wheels which work well on hard floors or on tracks.

Roller dollies can function as machinery dollies, load skates, slides, low profile wheels, casters, guides, linear bearings, and heavy-duty conveyors.  

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