These elements allow constructions in up to three levels, thus permitting almost limitless possibilities for the realization of creative ideas. To avoid various corner problems or increasing strength in the corner parts, the universal corner block with bold on receivers in various lengths is the answer. In the corner block as well as in the bold on receivers a small hole is drilled to match a spring pin so the position is determined. Easy to connect, safe and fully locked. The BLK-34- HD/FD34 Corner block 90º in 6 directions.