USG DONN Wall Angle (M7), 12' - 7/8" Designed to be part of USG's fast-install ceiling suspension system. Contents: 40 pcs. per box. Priced per piece. Application: Attached to the wall around the perimeter of the suspended ceiling system. Benefits: Easy to install. Sits on adjacent trim for extra support. Overlap ensures trim faces are level while eliminating unsightly gaps. Data Sheet