Control the amount of fresh air coming into your home with this casement stay lock. The twelve adjustable positions allow you to let in the right amount of air when needed. This casement stay locks your window closed with a key to give you added security, as well as securely allowing the window to be locked open enough for airflow but not enough to pose a security risk. From Australian brand, Tradco Hardware, it is made of stainless steel and finished in antique copper. Each one is supplied with two keys that can be keyed alike or cut uniquely - when you buy more than one casement stay lock, choose by making a note in the comments when you check out.