* Know the load that each castor will be carrying. This will assure safety of the user and at the same time, safety of materials that will be placed in it.

* Know the condition of floor where you are going to use it. There are floors that can easily damage wheels so you must choose the strongest type of heavy duty wheels.

* Know the environment. There are wheels that are specifically made for environments with high temperature and there are others for normal temperature. Always consider it to know which type of wheels you should get.