Abstract: A holding plate for sheet material is described, the holding plate comprising a disk-shaped plate, and an aperture formed by an inner edge of the disk-shaped plate, wherein the inner edge of the disk-shaped plate has a contour that comprises a plurality of fins, wherein each fin of the plurality of fins extends at least partially towards a center of the aperture, and wherein each of the plurality of fins is configured to allow a bending of the respective fin.

Abstract: A fastening system for mounting on a substrate is described. The fastening system comprises a sleeve and an inner element, wherein the sleeve comprises a holding portion, a spreading zone and a drill opening at one of the two ends of the sleeve and a tool opening at the other end, wherein the spreading zone is arranged at least partially between the holding portion and the drill opening, and wherein the inner element is arranged at least partially within the sleeve and is movable relative to the sleeve, and wherein the inner element comprises a drilling portion and an spreading portion, wherein the drilling portion comprises at least one cutting element and the drilling portion projects at least partially out of the drill opening of the sleeve and the spreading portion of the inner element is adapted to expand the spreading zone of the sleeve during a movement of the spreading portion in the sleeve and relative to the sleeve in the direction from the tool opening to the drill opening.