(KT2181). Light-duty commercial entry 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. Keying: 6 pin SCC keyway with 2 nickel keys per lock. 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. Deadlocking latch bolt operated by knob from either side except when outside knob is locked by push-button on interior. When exterior knob is locked, key in exterior knob or operating knob from interior unlocks push-button and retracts latchbolt. Closing door does not release push-button. For keyed alike, member must order directly from vendor.