Wide range of quality restrictor friction hinges which restrict window opening to 100mm. Available in 13mm and 17mm stack height for uPVC, aluminium and timber windows. The restrictive child-safety restrictions make it an ideal solution when ventilation is required in habitable rooms. Ideally suited to give protection from falls out of windows or for use on a child's bedroom. Our range of restricted friction stays are in stock for next day delivery. Read Less