90° Paper-Faced Metal Outside Corner Bead, 9 ft. Used for finishing 90 degree outside corners. Dimensions: A,D - 3/4 in., B - 13/16 in., C - 9/16 in., 9 ft. long. Benefits: Strong impact resistance. Forms superior bond with drywall compound. Suitable for use on any thickness of drywall. Reduces cracking along edges. Suitable for use on any thickness of drywall. Sheetrock® Paper-Faced Metal Corner Bead Brochure