4 Swivel Heavy Duty GREY RUBBER 50mm (2 inch) Castor / Caster Wheels (2 x standard, 2 x brake), Load capacity 40kg per wheel by Coldene Castors Grey rubber material - load capacity 40kg per caster Tyre diameter: 50mm, tyre thickness: 19mm Total height: 71mm Plate size: 50mm x 50mm Hole size: 6mm