The Von Duprin Grade 1 Rim and Vertical Rod Exit Devices can be used for all types of single and double doors with mullions. They will fit 1¾“ thick doors, and have a deadlocking latch bolt with a ¾“ throw. They cover stock doors with standard cut-outs, and have a hex key dogging feature that allows the door to be “dogged“ open if required. Several different trim pieces are available including knobs, levers, and thumb piece trim in different functions.