ClarkDietrich P21 Inside Corner Bead, 8 ft L, 3/8 in W, Metal, Galvanized

Platinum® tape-on inside 90 deg paper-faced corner bead provides very straight and precise inside corners. The rigid steel-reinforced inside corners provide a durable guide to achieve exceptionally straight and sharp inside corners. Paper-faced inside corners are embedded in joint compound and pressed firmly into place. Excess compound is removed with a drywall knife.