provided closable by a force directed against the adjacency surface of the holder application_number US 72062703 A description 0022 fig1 shows the holder 1 of the fastening device the holder 1 consists of an essentially rectangular plate articulated into a middle segment 2 and two end segments 3 forming the narrow ends the end segments 3 are each attached to the middle segment 2 by a blunt edged elevated step 4 on top of the holder 1 consequently the top of the middle segment 2 viewed from above lies deeper than the adjacency surfaces 5 formed by the tops of the end segments 3 for the cable tree to be fastened to the holder 1 the steps 4 facing each other on top of the holder 1 correspond to back to back steps 6 on its under side opposed to the steps 6 there are projections 7 configured at the outer corners of the end segments 3 the steps 6 and the projections 7 serve to secure the lateral position of tapes slung or wound about the cable tree and around the end segments in order to fasten the former for better adaptation of the holder 1 to the peripheral contour of a cable tree the end segments 3 and the middle segment 2 are provided with a curvature concave upwards whose axis of curvature lies on the longitudinal centerline of the holder 1 for fastening the holder 1 the middle segment 2 on its under side comprises two spring fingers 8 projecting downward the fingers 8 are arranged symmetrical to a longitudinal median plane.