Dorex 8503 C28 Medium-Duty Thumbgrip Trim – Passage Function – Aluminum Powder Coated8503 C28 This trim is designed for use with 8000 and 8500 Series exit devices Passage function suitable for non locking applications Architectural quality for medium duty commercial applications High quality aluminum powder coated finish Non handed field reversible UL and cUL listed for 1 1 2 hour fire rating 1 year limited warranty