5" x 1-1/2" Cast Iron Wheel w/ Roller Bearing | The Caster Guy
Syration Heavy Duty Caster Steel Cast Iron Wheel, Tool Box and Workbench Rigid Caster 800 LB Capacity (4 inch, 1 Rigid): Amazon.com: Industrial & Scientific
Cisco-Eagle Catalog - D Series Rigid Caster - 5" x 2" Cast Iron Wheel - 1,000 lb. Cap.
6" Inch Caster 617 lbs Swivel Black Cast iron Top Plate
CasterHQ 6" X 2" INCH Rigid/Fixed Caster - SEMI-Steel CAST Iron Wheel - 1200 LBS Capacity - 6 inch x 2 inch - Heavy Duty Industrial/Commercial 7-1/2" Overall Height: Amazon.com: Industrial & Scientific