The Asec Lockable 150mm Cable Window Restrictor Lock Brown is the ideal addition for home, public and commercial applications. When fitted the lock limits the distance a window can open, ideal for home & commercial safety. It is suitable for all windows and prevents fatalities and injuries. Brown Restrictor This lock has a brown finish to co-ordinate with the window finish. They are packaged individually complete with all necessary fixings, a key and full fitting instructions.