External corner adjustable, cut-concealing, halogen-free, SL 20x55mm, graphite black. External corner as a molded part for the electrical installation duct system, skirting board duct in accordance with DIN EN 50085-1 as a device installation duct. Cut-concealing external corner for snapping onto the base. The axially angle-adjustable (83-135 degrees) external corner enables structural inaccuracies to be compensated for.