The cube connector type I with the dimension 20x20x20 can be fastened by means of pan-head screws DIN 7380 M5x14. This allows frames or bonnets to be made quickly, depending on the version. For frames, please use 2D versions, for bonnets, however, 3D. An M5 thread is required for machining, which you can also purchase in the shop. During assembly, guide lugs may have to be broken off or filed down for profiles with covered grooves.