Tell Manufacturing CL100002 Passage Knob, Steel, Satin Chrome, 1-3/4 to 1-3/8 in Thick Door

Heavy-duty commercial passage ball knob, Satin stainless steel (US32D), complies with ANSI A156.2, Series 4000, Grade 2 (400, 000 cycles), UL listed for 3 hr fire door. Door range of 1-3/8 to 1-3/4 in. Backset of 2-3/4 in standard. Strike, T strike (1-1/8 x 2-3/4 in) standard. Cylindrical, steel-coated with zinc dichromate (corrosion resistance). Latchbolt operated by knob on either side at all times.