Slot nut with fixing system by pin screw for quick and easy assembly, the slot nuts are essential. Quickly inserted into the 10 mm piping groove and positioned, they help immediately with any assembly and disassembly. How many slot nuts do I actually need? We recommend 5-6. 3-4 for the middle roof bars, 1-2 for the middle pitching poles. The outer poles recommend for a quick and possibly one-handed assembly always with the original "Torpedo slot nuts". They are quickly threaded and locked. This is only necessary for the outer poles.