1.Rack caster 2.Materials: PP core PU 3.Dia.: 100~200mm 4.Loading capacity: 300~450kg 5.Steel roller bearing Red PU Tread , Black PP core scaffold caster - rack caster, storage equipment, component, accessory, construction tool.Item No.: SCXXXNPUDia.: 100mm,125mm,150 mm, 200 mmLoading capacity: 300 kg, 450kgsteel roller bearingCustom design and OEM are welcome. rack caster, construction tool