A strong corner piece for building frames out of 2020 Aluminum extrusion. Each of the three pieces joined together by the part are contacted by three screws each in a triangular pattern. The part fits into the extrusion's slot for a tight secure fit. The screw holes are for M4 screws with hex socket head caps, there is a 2mm counter sink on each holes. One of the screw holes is for an M6, the hole on the end of the extrusion must be tapped for this. General Specs: - Print at 40% for Strength, PLA is fine - Layer height at 0.2mm for screw hole/countersink accuracy - M4 Metric Screws with 2mm Countersink - Channel slots for tight and square fit - M6 Metric screw for extrusion end tapped hole - Each Aluminum piece is contacted by three screws in a triangular patter for max rigidity