Transoms ledgers with fittings at both ends lock into wedge housings or captive collars welded on verticals at 1000/500 mm/c/c to form scaffolding or staging. Erected like mechano with no error in spacing in both the directions. Main advantage of allowing change in working levels by removing and refixing Transoms ledgers at different levels without disturbing scaffolding. Easy and fast erection with only a hammer. No loose parts.