"For lavatory or other privacy door.Either knob operates latch bolt unless outside knob is locked by push-button Inside. Button automatically releases when inside knob is turned or door is closed.A coin inserted and turned in emergency slot will unlock door from outside. Inside knob is always active.Latch Plate-Stainless steel"Suitable For Door Thickness-35-50 mm,Accessories Included-Latch, Latch Plate, Striker, Screws,3 Brass Keys,Stainless Steel,75x75x59mm,60mm