This is our Machinery Keyless Keypad Security Entry Door Lock with Emergency Override Keys. It is Suitable for office use, home or apartment. Caution:Please read the instruction thoroughly before using the unit. Please retain this manual for future reference. Great for office use, home or apartment Zinc alloy integrative structure Easy to installation Opened by code Suitable for Both left door or right door Standard 2 3/8 inch backset Size of the keypad part: Length:108mm（4.25in） Width:43mm(1.73in) Thickness:21mm(0.83in) Size of the back part: Length:108mm（4.25in） Width:43mm(1.73in) Thickness:17mm(0.67in) Material: Zinc alloy Color: Silver Package including: 2x Door lock 2x Instructions Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.