This 6" x 2" Ductile Steel Rigid Caster is an ideal preference for those who desire a durable product qualified for carrying incredibly heavy weight loads, with concern for floor conservation. Ductile steel caster wheels are made from a mixture of unique alloys that grant it higher weight capacities than cast iron caster wheels. In addition, ductile steel caster wheels are further economically friendly than drop-forged wheels. They also feature an extra thick walled, heavy duty core, hub, and tread.