Roto North America introduced its ELA special opening restrictor as a safety feature installed on large turn-only aluminum windows. The device locks in the end position and is controlled by the handle. Using Roto TiltFirst technology, the user can only open the sash as far as the defined end stop position. Available in screw-in and clampable versions, it can limit the opening angle to 3 ½ inches and can be installed in windows that weigh up to 400 pounds.