Abstract: A one-piece fastener for securing a lining element in a removable and adjustable manner to a carrying surface which is to be lined or finished, such as a wall or a ceiling. This fastener is made of a thin plate having, on one face, at least one fastening tongue intended to be inserted into a corresponding groove provided on the lining element in order to secure and hold on to the latter. The plate has, on the other face, at least one set of teeth capable of simultaneously locking, in a reversible manner, by simple pressure on two parallel edges forming an integral part of a rail secured rigidly to the carrying surface to be lined or finished. The invention also relates to a system for removably securing a plurality of identical lining elements parallel to one another on a carrying surface, the said system comprising at least two rails capable respectively to receive two fasteners inserted through the ends of each lining elements to be secured.