Castor set, 2 swivel castors and 2 fixed castors, wheel 180 mm. Supplied = assembled. Wheel diameter = 180 mm. Wheel type = nylon. Wheel fittings = 2 swivel castors with 1 x stops, 2 fixed castors. Overall height = 220 mm. 2 swivel castors and 2 fixed castors each made of nylon, wheel 180 mm. One swivel castor with wheel stops, overall height 220 mm.