4 Inch Heavy Duty Iron Core PU Caster – 800kg Load Capacity, Black Steel Bracket, Orange PU Wheel 4" Heavy Duty Iron Core PU Caster 800kg | CNC Engraver & Tool Cart WheelsMeta Description: 4 inch (100mm) iron core polyurethane caster with black painted steel yoke, orange PU tread Shore A 90–95, 6202 bearing, 280kg capacity. Ideal for CNC engraving machine, bench lathe, SMT cart, tool chest. Keywords: 4 inch heavy duty caster, 100mm iron core PU wheel, 280kg caster wheel, CNC