Adjustable internal corner, cut-covering, halogen-free, SL 20x55mm, graphite black. Internal corner as a form part for the electrical installation channel system baseboard channel according to DIN EN 50085-1, serving as a device installation channel. The cut-covering internal corner snaps onto the base part. The axially adjustable (83-135 degrees) and simultaneously extendable internal corner allows for compensation of structural inaccuracies as well as better adherence to bending radii.