Rubber tyre, thermoplastic, with mounting plate, wheel x width 50 x 18 mm, fixed castor. Supplied = assembled. Wheel diameter = 50 mm. Structure = fixed castor. Wheel material = rubber - thermoplastic rubber elastomer (TPE) Material of rim = polypropylene. Housing material = steel. Max. load at 4 km/h = 50 kg. Type of mounting = with top plate. Wheel width = 18 mm. Overall height = 70 mm. Wheel bearing = ball bearing. Temperature resistance = -10 C to +70 C. Screw hole diameter = 6 mm. Fixed castor plate dimensions = 56x56 mm. Swivel castor plate dimensions = 60x60 mm. Screw hole spacing = 38x38 mm. Housing surface = zinc plated. Shore hardness = 85 A. Non-leak tyres. Low rolling resistance, smooth running. Non-marking tyres, hardwearing. Hardness 85 Shore A. Temperature resistant from -10 C to +70 C. Swivel bearing with double ball race. Also available as electrically conductive models on request.