Fasteners work simply via a catch and release mechanism via a mortice plate on the edge of the window frame. Espag. handles are designed to operate an espag. lock which is fitted inside the window frame. Espag. locks are a secure shoot bolt system which operate when the espag. handle is turned, moving the spindle to work the lock. These handles are equipped with a long spindle which can be cut down to the desired length but come in a standard diameter to ensure they’re compatible with standard lock types. It’s important to note that our espag. lever handles are handed so you’ll need to ensure you choose the correct hand. All our espag. handles also come with a locking grub screw underneath the handle which can be locked into place with an Allen key for additional security.