The steel bracket is very thick, a bit thicker than the small wheel products on the market. Cast iron wheels are very suitable for storage cabinets that have to be in one place for a long time or need to be heat resistant.
Solution to minimize overall height and maximize load capacity. Dual wheel casters also improve stability and swivel more easily than wider-face single wheels. However, this 40mm diameter caster is the most "ugly" one of the Series.