1/2 in. Paper-Faced Metal J-Shaped Trim, 8 ft. Completely surrounds the rough edge of drywall to create a strong clean corner. Dimensions: A - 1/2 in., B - 9/16 in., C - 5/8 in., D - 1-1/16 in., 8 ft. long. Benefits: Eliminates nailing and nail shrink-back. Can be used to finish off bi-fold doors and/or under doors and window encasings. Forms superior bond with drywall compound. Reduces cracking along edges. Sheetrock® Paper-Faced Metal Corner Bead Brochure