This is a fully procedural T-profile defined by the standards of DIN EN 10055 to build technical structures. It’s built with geometry nodes of Blender 3.6.2 and you can choose the size by changing the value of “Größe” in the properties section of the item. There is also a property value called “Länge” where you can procedurally change the length of the part.

All dimensions like round bevels, material thicknesses and inclines are built according to the above-mentioned standard.