(KC2376). Heavy-duty commercial privacy ball knob. Satin stainless steel (US32D). Performance: Complies with ANSI A156.2, Series 4000, Grade 2, (400,000 cycles). UL listed for 3 hour fire door. Door range: 1-3/8" to 1-3/4". Backset: 2-3/4" standard. Strike: T strike (1-1/8" x 2-3/4") standard. Cylindrical, steel-coated with zinc dichromate (corrosion resistance). Latchbolt operated by knob from either side. Outside knob locked by push-button on inside. Unlocked by emergency release on outside or rotating inside knob or closing door. For keyed alike, member must order directly from vendor.