TIP CORNER:  Good things do come in small packages.  This caster combines a low height with the strong construction of casters much larger.  The typical applications are for low height trolleys and platforms that carry significant loads.  Equipment dollies, shop carts, warehouse carts, bakery equipment are common uses.  Pick the cast iron wheel for non-marking, heavy applications where floor debris such as metal shavings are present.   Cast iron is not a floor protective wheel and is noisy in operation.