Dorex 8510 B C32D Medium-Duty Knob Trim – Passage Function – Stainless Steel8510 B C32D This trim knob 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 stainless steel finish Non handed field reversible Knob diameter is approximately 2 1 8 3 rosette diameter UL and cUL listed for 1 1 2 hour fire rating 1 year limited warranty