Heavy duty solid aluminium Raail load capacity 40 KG per meter (if ceiling is strong). Easy to mount and use. You can add and remove cables/rods from any point of rail. Profile Size 20MM (Along the ceiling) X 19MM )Sticking out from Ceiling X 8 MM (Bottom of lip) X 8MM (Front of Lip). C-rail picture hanging system is extended version of J-rail Wall system which is one of the most popular wall mounted system in the market. C Rail picture hanging system allows to add & remove picture hanging cables from any part of rail. With this system you can use picture hanging nylon cables (PERLON), steel cable or 4MM square steel rod. With this system you can hang pictures one above other by sliding extra picture hooks on same cables/rods or can move art work left to right without any screwing or unscrewing.