Prest-On's Corner-Back Drywall Fasteners allow you to adjust for framing inaccuracies up to with width of the stud. Save carpentry, electrical, plumbing and HVAC installation time. Corner-backs will reduce costly callbacks due to ceiling / partition separation from truss uplift. Produce hard-fastened corners by attaching intersecting wallboard panels to a common stud. Eliminate cut blanket installation at the corners. Save energy by eliminating uninsulated stud boxes at corners and partition intersections.