Tube Type Scaffold Castor 200mm S883BRichmonds range of scaffold platform castors are compatible with Kwik Stage Steel Scaffolding and mobile Aluminium Scaffolding Platform products. Richmonds S883B Tube Type Scaffold Castors are suitable for Kwik stage steel scaffold leg: 48. 3mm OD x 4. 0mm wall thickness = 40. 3NB, mobile aluminium scaffold leg 48. 4mm OD x 4. 47mm wall thickness = 39. 46NB. Richmond tube type scaffold castor is designed to accommodate a variety of scaffold tubing