Cold rolled steel parts for use in construction work, together with laminated plasterboard and gypsum board products where the frame is not load-bearing. Inverted V-shaped profile with alternating 6- and 8-mm holes at the top every 10 cm and forks punched in the bottom every 10 cm into which the T-45 profiles are slotted to create the load-bearing frame for the drop ceiling. It has a nominal width of 33.5 mm, with a height of 43.5 mm. It is made of 0.8-mm thick Z140 galvanised steel plate.