A coupler for the attachment of an armor panel to a structure to be protected, the coupler having a first end unit configured for attachment to the armor panel and a second end unit configured for attachment to the structure, the units being axially spaced from one another by an elongated plate member having, in cross-section taken along a plane perpendicular to the axial direction, an asymmetric shape allowing the plate to be differently susceptible to bending forces in at least two different directions.