GZYF Keyless Digital Machinery Code Keypad Password Door Lock Fit door thickness: 35-60mm, suitable for wooden doors and steel doors, Must be used on a new (uncut) door; Great for office use, home or apartment Zinc alloy integrative structure, firm and durable Precise design, compact structure, fully functional, fashionable style, full mechanical action witho Very easy to operate. with manual paper Check the link in the production description for installation vedio before your purchase