Kwikset 156SYLSQT-15S Sydney Square Entry Door Lock, Satin Nickel

Keyed Entry (Single Cylinder) Function: This lever set is locked and unlocked from the exterior using a key and can be locked and unlocked from the interior using the push button located on the lever. Perfect for securing entrances side doors and anywhere else that needs a bit more security.BumpGuard : Lock bumping is an attack technique used to defeat conventional pin and tumbler locks. Kwikset's BumpGuard component utilizes a patented side locking bar which replaces the traditional pin and tumbler design providing protection against lock bumping.