"For entrance doors.Deadlocking latch bolt.Either knob operates latch bolt (except when outside knob is locked from inside).Pushing button in on inside knob locks the outside one.Turning inside knob or turning key in outside knob releases locked outside knob. Latch bolt is operated by key in outside knob or by rotating inside knob.Inside knob is always active.Latch Plate-Iron" Suitable For Door Thickness-35-50 mm Accessories Included-Latch, Latch Plate, Striker, Screws,3 Brass Keys,Polished Brass,75x75x59mm,60mm