The Yale P334 Rim Sash Lock has typical sash lock functions, allowing it to be fitted with handle or knob sets using an 8mm follower. Additionally the deadlocking feature allowing this model to be locked and unlocked from both sides using one of the 2 provided keys. We recommend using this lock for low level security applications such as interior rooms or exterior garden sheds etc. This is aided by its 2 lever locking mechanism which provides a moderate level of security in comparison to most door locks.