1. castors with different sizes 2. castors with different models 3. castors with unbeatable performance Specifications:1. material: cast iron core, PU wheel, Korean type, both swivel and fixed available, double bearing2. diameter: 100/125/150/200/250mm3. capacity: 450/500/550/600/800kg4. width of wheel: 50mm5. thickness of plate: 10mm6. plate size: 111*140mm Castors C600 EPU