Abstract: A removable wall construction system and fastener for same. Wall panels are mounted to aperture vertical studs via one-piece fasteners. The fasteners comprise a piercing means for attaching the fasteners to the edges of the wall panels, and aperture penetrators for attaching the fasteners to the studs. The aperture penetrators comprise transversely deflectable side arms or projections removably insertable into the stud apertures. These deflectable side arms are provided with inwardly bent distal end portions for improved retention in place following insertion.