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Finely crafted with a machined hub, wheel face and double ball bearing heat treated raceways, these versatile casters are ideal for a wide range of applications, such as dollies, platform trucks, warehouse carts and freight terminals. 6 Inch Semi Steel Wheel Rigid Caster with Roller Bearing The semi-steel cast iron wheel is built to withstand high capacity, heavy loads up to 1250 lbs and in temperatures up to 600°F.When searching for a reliable and durable solution for heavy duty projects, consider Service Casterâs Series 30 top plate semi steel cast iron wheel casters.Service Caster is unsurpassed in quality, reliability, and excellent customer service.