Keyless Window Restrictor | Twr01wa Suitable for doors and windows 20cm long restrictor Window opening to under 100mm Fittings included Tessi Keyless Window Restrictor | Twr01wa Tessi Keyless Window Restrictor can be used on all types of windows and doors including uPVC, aluminium, wooden and metal profiles. It's 20cm long restrictor restricts window opening to under 100mm and can withstand forces over 1000N (1KN). Keyless feature means cable is locked into place without the need of the key. The unit is lockable so the window can be fully opened if necessary. Supplied with 4 screws. Resistant to oxidation and corrosion.