Dorex 9500 TK70 26D Heavy-Duty Knob Trim – Classroom Function – Satin Chrome9500 TK70 26D This trim knob is designed for use with 9500 Series exit devices Classroom function suitable for doors that need to remain locked or unlocked for lengthy or specific periods Architectural quality for heavy duty commercial applications High quality satin chrome finish Non handed field reversible Schlage C 6 pin re keyable cylinder Knob diameter is approximately 2 1 4 3 3 8 rosette diameter UL and cUL listed for 3 hour fire rating;