Phillips kwikSTIK® 1/2" P4 L-Trim tape-on trim is ideal where wallboard abuts with suspended ceilings, beams, plaster, masonry and concrete walls, as well as untrimmed door and window jambs. L-Trim features approximately 20% thicker steel than ASTM standard C1047 minimum requirement for a strong, durable corner. No fasteners or nails are needed for installation, and specially engineered paper provides superior mud and paint adhesion. Also available without a bead.