Clinch-On “U” bullnose cornerbead trim was designed to cap drywall for a professionally finished drywall edge at window and door jambs. Our “U” bullnose trim can be used where drywall abuts plaster, beams, wood, masonry or concrete. Our 1/2″ flange provides you with liberal installation space for nailing, stapling or screwing our cornerbead to drywall. Our proprietary steel coating gives our “U” bullnose trim a dark (dull) appearance and superior adhesion qualities compared to shiny hot dipped galvanized steel."