Panel with a fastening device

A set comprising a supporting structure, a first panel, a second panel and a fastening device for securing the first and second panels to the supporting structure, wherein the fastening device comprises a top portion, having a top surface, a bottom surface, a first edge portion and a second edge portion, a first leg and a second leg protruding downwardly from the bottom surface, wherein the first panel comprises a first edge groove, and the second panel comprises an opposite second edge groove, the first edge portion being configured to be inserted into the first edge groove, and the second edge portion being configured to be inserted into the second edge groove, wherein:

• the first leg and the second leg are flexible and bendable towards each other;
• the first leg comprises a first locking element and the second leg comprises a second locking element;
• an upper surface of the supporting structure comprises an insertion groove comprising a first undercut groove and an opposite second undercut groove;
• and
• the first locking element is configured to be snapped into the first undercut groove and the second locking element is configured to be snapped into the second undercut groove to a locked position,
• wherein the fastening device and the supporting structure are configured such that, when the first and second legs are being inserted into the insertion groove, contact between the first and second locking elements and corresponding walls of the insertion groove causes the first and second legs to bend towards each other, and wherein the first and second legs unbend in a direction away from each other at the locked position.