Universal Hardware Commercial Entry Knob features turn/Push button locking. Push or turn inside button to lock the outside knob until it is unlocked with use of key or button is manually unlocked. The deadlocking latch bolt is operated by the inside lever at all times. Designed with a tubular chassis for light commercial and residential uses. This lever fits doors from 1-3/8” to 2” thick. It has a 3 hour UL fire rating, exceeds ANSI Grade 2 standards.