Heavy-duty PU on plastics swivel caster with brake loading capacity: 200kg to 500kg diameter:4"x2",5"x2",6"x2",8"x2" Heavy-duty PU on plastics swivel caster with brake1.color:black2.loading capacity: 200kg to 500kg3.diameter:4"x2",5"x2",6"x2",8"x2"4.material of wheel: PU on plastics Heavy-duty PU on plastics swivel caster with brake