PRO-90 Archway corner bead is an extra rigid vinyl archway designed with slotted flanges that easily forms to curves and arches. The radius on the nose aids in smooth and easy finishing. The notched single flange adapts to virtually any radius condition. Multiple perforations along flanges and notches enhance compound and veneer plaster bonding. In addition to nail or staple fastening, an adhesive should be used to secure arch tabs to gypsum board.