Flat Tear Away L Bead is a lifesaver for finishing around windows and doors where the drywall is butted too close to slip a return leg behind it.
Drywall Trim-Tex Bullnose & KlinchSTIK Corner Bead/Tear Away L
Trim-Tex Arch Plus 90° Combo Bead - Wallboard Trim & Tool
CDS
Phillips Manufacturing Company 8 ft. x 5/8 in. Vinyl L Trim (80-Pack) LT6VYL 8 - The Home Depot
tear away pvc high good quality
Butting Drywall to a Different Surface - Fine Homebuilding
Gibraltar Building Products 1/2 in. x 10 ft. Vinyl L-Trim with
Drywall Trim-Tex Bullnose & KlinchSTIK Corner Bead/Tear Away L
Tear Away 1/2 10' L-Bead
Trim-Tex Flat Tear Away Bead