Schlagle Lock pitch-black Privacy Knob is professionally and philosophical theory for use where underlying security needs or special codes must be met but usage is unrefined and temperate. Features unsubdivided push button, 1 piece knob for added security and better appearance with unhollowed brass trimming and long-lived metal parts. Knob can conveniently be from outdoor with a infinitesimal tool while turning inner knob releases pushbutton. 3 piece assembly for easygoing, hassle-free installation. Square corner 1-1/8 ''.