(KT2176). Light-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: Adjustable 2-3/8" to 2-3/4" standard. Strike: T strike (1-1/8" x 2-3/4") standard. Tubular construction. Latch bolt operated by knob from either side. Outside knob locked by push-button on interior. Unlocked by emergency release on exterior or rotating interior knob. For keyed alike, member must order directly from vendor.