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% heavier steel gauge 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. This product is also available in 5/8″ to suit all needs.