This Sash Heritage locking Sash Lift is spring-loaded and fitted with a hook that engages with a keep fitted to the window sill preventing the window from opening.This lift allows the window to be opened easily by pushing the lift forward enabling the hook to be released.Material: BrassSize of Plate: 47mm x 30mmHeight of Product: 40mmSpring-loadedComes with ScrewsAvailable finishes: Antique Brass, Polished Chrome, Satin Chrome, Polished Brass or Satin NickelPart of the Sash Heritage collection of Sash Window FurniturePlease note: When fitting YOU MUST pre drill the screw holes or use a similar sized pozi screw to make the thread of the screw in the window first. Then carefully tighten the screw with a HAND screwdriver.