This invention relates to a guard (10) for use in the assembly of a protective demountable lining for walls of a structure that is used in the handling of abrasive particulate materials, such as a bin. The guard (10) includes a body (11) having an external face (12) and an opposing internal face (13), and a leading edge portion (14) and an opposing trailing edge portion (15). The guard (10) also includes at least two elongate wear elements (18 and 19) that extend upwardly from the external face (12) and generally transversely across said external face. The wear elements are arranged one behind the other, and wherein said wear elements include a base portion (22) and an opposing crest portion (23), said base portion and said crest portion being connected by an intermediate portion (26) having a leading face and a trailing face. The crest portion (23) includes a lip portion (24) that extends outwardly in the general direction of the leading edge portion (14) and which overhangs a portion of said external face (12) adjacent said base portion such that the trailing surface of the first west element (18) combines with the lip portion and the leading face of the second wear element (19) to form a pocket (19). In use the pocket may retain particulate material that in turn shall provide at least some protection for the external face (12) from wear caused by particulate material flowing over the guard (10).