These are used to drain out rain and waste water from roads and enclosed compounds. The hinge in these gully gratings are helpful in fixing then tight and also make it easy to pull out for maintenance. It is realized with two triangular elements, with support on three points so as to have a high stability and avoid any rocking. The particular shape of the slots allows the installation in any position, in order to ensure safety at the passage of cyclists. The top wall has a non-slip grip, which prevents obstructions and the deposit of leaves, paper or similar.