Trim-Tex - Add Trim-Tex Reveal Corner Bead to 90-degree outside corners to create a beautiful reveal detail. Reveal Corner Bead creates the look of drywall layers without needing to install an additional
4-Pack Trim Tex Corner Bead Bullnose 90 and 135-Degree Mitre/Miter Gauge - Mark Inside Cornerbead Cuts for Window Sills and Door Frames - Amazon.com