Keyed entry function is perfect for use on entry doors where keyed security is needed, and unlocks from the inside when the door handle is rotated, allowing you to leave quickly and conveniently and re-enter easily from the outside. Easy installation: self-aligning screw holes make installation easy and hassle-free, everything is included to upgrade single borehole doors; fits both right and left-handed doors, upgrades an existing door locks you with no skill required-easy to install in minutes with only a screwdriver.