Window Stopper Upvc Restrictor Child Lock Safety Set W/fixing Catch Screws. Features: Concealed Window Restrictor Hook Child Safety Lock This Product Was Designed with Child Safety in Mind. It Will Automatically Restrict the Window Opener to 100mm with Its Clever Spring Loaded Design. It Can Be Released to Allow the Full Opening of the Window but Will Automatically Re-engage Once It is Closed and Reopened. Specifications: Restricts the Window Opening to 100mm Manufactured from Stainless Steel Spring -loaded Automatic Arm Available in Left and Right Hands Restrictor Position Guide Size:48mm X 102.8mm Package Included: 1 X Window Stopper . We are an international seller, your order will be shipped from abroad so please allow the necessary time of minimum 14 working days for delivery right now depending on where you ship to, due to ongoing delays in postal deliveries globally.