The Tessi Keyless Window Restrictor is suitable for any window or door. It fits wood, steel, aluminium or UPVC, security screws are supplied and no key is required which makes it Fire-Safe. It complies with Product Safety Directive and the related standards EN16281:2013. In order to comply with Irish Building Regulations it is necessary to stagger the receiver and base unit to ensure a maximum opening of 10mm when unlocked.