A set consisting of a fastening element and a counterpart, wherein the fastening element serves to prevent the unwanted release of a connection between the fastening element and a counterpart, wherein the fastening element is set up to come into engagement with the counterpart via a rotational movement of the fastening element about an axis of rotation in a connection direction, and the fastening element has: an elastic element with a contact portion for contacting the counterpart, wherein the elastic element is configured such that it is arranged at least in portions at an angle to a radial relative to the axis of rotation on a plane perpendicular to the axis of rotation, wherein the fastening element and the counterpart are configured such that in the connected state of the fastening element and of the counterpart the contact portion contacts the counterpart in a contact point and that a tangent in the contact point relative to the axis of rotation extends at least to a portion of the elastic element on the plane perpendicular to the axis of rotation at an angle unequal to 90°, as a result of which the radial forces during rotation of the fastening element in the connection direction and in an opposite direction to the connection direction are different, so that a transmission of force to the elastic element during rotation of the fastening element about the axis of rotation in the connection direction is smaller than during rotation of the fastening element in an opposite direction to the connection direction, and wherein the elastic element is configured such that the contact portion of the pre-stressed elastic element and the counterpart at least during the initial rotation of the fastening element in the opposite direction to the connection direction are non-positively connected. an elastic element with a contact portion for contacting the counterpart, wherein the elastic element is configured such that it is arranged at least in portions at an angle to a radial relative to the axis of rotation on a plane perpendicular to the axis of rotation, wherein the fastening element and the counterpart are configured such that in the connected state of the fastening element and of the counterpart the contact portion contacts the counterpart in a contact point and that a tangent in the contact point relative to the axis of rotation extends at least to a portion of the elastic element on the plane perpendicular to the axis of rotation at an angle unequal to 90°, as a result of which the radial forces during rotation of the fastening element in the connection direction and in an opposite direction to the connection direction are different, so that a transmission of force to the elastic element during rotation of the fastening element about the axis of rotation in the connection direction is smaller than during rotation of the fastening element in an opposite direction to the connection direction, and wherein the elastic element is configured such that the contact portion of the pre-stressed elastic element and the counterpart at least during the initial rotation of the fastening element in the opposite direction to the connection direction are non-positively connected.