Dorex 8570 B C32D Medium-Duty Knob Trim – Classroom Function – Stainless Steel8570 B C32D This trim knob 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 stainless steel finish Non handed field reversible Schlage C 6 pin re keyable cylinder Knob diameter is approximately 2 1 8 3 rosette diameter UL and cUL listed for 1 1 2 hour fire