Mechanical Keyless Entry Door Lock - NoBatteries, No Hassle This second-generation mechanical keylessentry door lock requires no wiring or keys, automatically lockingwhen the door closes, providing strong anti-theft protection andgiving more convenient and effective security. This mechanical keyless door lock iscompatible with doors ranging from 1.4 to 2.5 in (35-65 mm) inthickness. It comes with multiple sets of mounting spindles andscrews, allowing you to choose the appropriate installationaccessories based on your door type for better flexibility andconvenience. Designed with an adjustable thumb knob,surface installation, and enlarged mounting plates, the keylessmechanical combination door lock allows you to replace your olddoor hardware without additional cutting or drilling. Simply swapout the old lock with the new one to maintain door'sappearance. Automatically locks when the door isclosed, enhancing your home's security. The upgraded stay-open modefacilitates frequent entry and exit, making it especially suitablefor children or the elderly. When this feature is enabled, themechanical door lock functions as a regular door handle. Secure your home with a high-qualitymechanical combination door lock. The zinc alloy latch boltavoids forced entry, while the stainless steel strike platewithstands harsh weather, providing water, rain, sun, freeze, andrust resistance.