Flints stocks the versatile plug type scaffold castors which are suitable for converting steel rostra into slave trucks [with the addition of a short scaffold sleeve if going directly into the rostra corner post]. Fitted with strong nylon wheels. Has a safe working load (SWL) of 535 kg. NB: Due to manufacturing tolerances on the plug and the tube, the castor can sometimes be a slack fit. See page 238 for full tech specs! Conversion Sleeve A 127 mm length of scaffold tube to convert the plug to fit the corner posts of Steeldeck/ Megadek rostra systems. Not needed when the castors are mounted on scaffolding legs first.