Amerimax 1.25 in. W x 8 ft. L Galvanized Steel 90 Degree Corner Bead (Pack of 63)Metal drywall beads and trims are traditional reinforcement and finishing products used in gypsum wallboard construction. Metal beads and trims provide crisp, clean and straight protection for drywall corners. The most common metal trim is drywall corner bead. Corner bead is applied to 90 degree exposed outside gypsum corners to provide a strong, durable, straight, crisp finished corner. Metal beads and trims are nailed, screwed, stapled or clinched