The Corbin Russwin UT5220 Privacy Lock-Pre-Assembled Unit Lock,

The function is, Latchbolt by grip on either side. The outside grip is locked by a push button. The outside grip is unlocked by the emergency release tool outside, by rotating the inside grip, or by closing the door. The inside grip is always free. The Corbin Russwin UT5220 Privacy Unit Lock is Ideal for, Schools, Universities, Office Buildings, Historic Buildings, Institutions, and High Traffic Areas. For Doors 1 3/4" Thick, 2 3.4" backset, Lock Chassis One-piece investment cast frame. Machined internal parts of steel, bronze, and stainless steel. Zinc dichromate for corrosion resistance. Corbin Russwin UT5220 Pre-Assembled Unit Lockset, Strike Wrought brass or bronze, ANSI strike with nylon adjusting screw, standard. 4-7/8", ANSI/BHMA Designed to meet A156.2 Series 2000. Meets A117.1 A