【Installation Instructions】: Suitable for drilling holes with a diameter of 21 mm and for the thickness of most cabinet/drawer doors from 15 to 18 mm. 【High-quality workmanship】: The knob lock is made of solid zinc alloy, durable, clean, burr-free, rust-free and corrosion-resistant, can be used for a long time. 【Easy to install】: Equipped with screws and replacement lock covers and a strike plate makes installation easy. All you have to do is screw the hole and tighten it. 【Easy to use】: The lock is easy to open and close. No key required. Simply press the button to close or open the lock. 【Wide Application】: Well suited for front door, wooden box, desk, drawer, cupboard, closet used as door lock, shed lock, cabinet lock, etc.