Phillips kwikSTIK® 5/8″ 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. This product features approximately 20% heavier steel gauge than ASTM standard C1047 minimum requirement for a strong, durable corner. This product is tape-on meaning no fasteners or nails are needed for installation. Specially engineered paper provides superior mud and paint adhesion.