Assembly for detachably connecting at least two components (BT1, BT2) by means of a fastening device, wherein the fastening device comprises a first and a second fastening portion (BA1, BA2), each extending along a central longitudinal axis of the securing device and arranged opposite one another, wherein the first component of the assembly, by means of the first fastening portion, and the second component of the assembly, by means of the second fastening portion, can be connected to one another, wherein the first fastening portion comprises a first locking portion on the free-end side, wherein the first component has an upper side (23.1) and a lower side (23.2) in at least one portion, so as to form a detachable clamping and/or positive-fit (interlocking) connection, which span planes running parallel to one another in the portion, wherein the portion comprises a preliminary hole or opening which deviates from a circular shape, and of which the cross-section is matched to the longitudinal section of the first locking portion, and specifically in such a way that the first locking portion can be fed through the preliminary hole, and, by rotation about the central longitudinal axis, the securing device can be fastened with the first fastening portion to the first component by clamping and/or by positive fit (interlockingly), wherein the second fastening portion comprises a second locking portion on the free-end side, and wherein the second component has at least one profiling portion which forms a cut-out, of which the cross-section is matched to the cross-section of the second locking portion, and specifically in such a way that, for the detachable clamped securing of the second fastening portion to the second component, by the rotation of the second locking portion about the central longitudinal axis, the second locking portion can be received at least partially interlockingly in the cut-out, wherein the first fastening portion comprises the first locking portion on the free-end side with at least one locking element extending radially outwards from the central longitudinal axis, wherein the fastening device comprises in its second locking portion a clamping body, which in its lateral cross-section of the locking position has the greatest length at the end section (30.1) facing towards the second component, and tapers in cross-section along the central longitudinal axis in the direction of the first fastening portion, and wherein the clamping body comprises in the region of its free end portion (30.1), on at least two opposing sides, in each case two straight contact surfaces (30.2, 30.3). wherein the first fastening portion comprises the first locking portion on the free-end side with at least one locking element extending radially outwards from the central longitudinal axis, wherein the fastening device comprises in its second locking portion a clamping body, which in its lateral cross-section of the locking position has the greatest length at the end section (30.1) facing towards the second component, and tapers in cross-section along the central longitudinal axis in the direction of the first fastening portion, and wherein the clamping body comprises in the region of its free end portion (30.1), on at least two opposing sides, in each case two straight contact surfaces (30.2, 30.3).