Suitable for windows which are not going to be opened frequently. There are two types of dual screws some have a lock-plate for the outer frame; others have barrels for both inner and outer frames. This type of lock is a highly secure device used on a sash window. Once the window is closed, screw the bolt into the barrel with the key.
Our forum is the perfect place to ask questions and get help. Join us, post your question/comment now!
