The invention relates to a construction tool, particularly a plane for working on plaster surfaces or plaster base surfaces. The aim of the invention is to create a construction tool of this type, particularly a grid-type plane, which is characterised by a high degree of structural strength, is advantageous compared to prior designs in terms of handling, and can also be produced even more economically in terms of manufacturing. According to the invention, this problem is solved by a construction tool, particularly a plane for working on plaster or plaster base surfaces, which comprises a base body (1) designed as a grid structure, having a plurality of working ribs (2-7) which form as such a working edge region (AK) that dips into a working zone, - at least two of said working ribs being designed as longitudinal limbs of a U-shaped profiled element that opens towards the working zone, and on each U-shaped profiled element, a securing tab (F1, F2) made from a cutout portion of said U-shaped profiled element be
