Furniture Castor Wheel Material: iron & nylon Color: black, white,grey, bronze-colored with or without brake Furniture Office Chair Caster Wheel Material: zinc alloy & plasticColor: black, white,grey, bronze-colored1) Material: iron and nylon2) Diameter: 38mm, 52mm3) With plate/ screw/ panel holder/ sawtooth ring4) With brake/ without brake5) Panel size is 38*38mm, and can be customized.6) Hole ...