Dorex 8505 C28 Medium-Duty Thumbgrip Trim – Classroom Function – Aluminum Powder Coated8505 C28 This trim is designed for use with 8000 and 8500 Series exit devices Classroom function suitable for doors that need to remain locked or unlocked for lengthy or specific periods Architectural quality for medium duty commercial applications High quality aluminum powder coated finish Non handed field reversible Cylinder included UL and cUL listed for 1 1 2 hour fire rating 1 year limited warranty