Package Includes2 window latches, 2 mounting hooks, 4 screws. Our window locks can be inserted directly into your original door handle and can be fixed directly without additional mounting screws. Sturdy and DurableWindow lock length 10.5cm, windproof hook Made of high quality stainless steel with white coating to ensure it is rustproof and durable. ProtectionAlso suitable as a cat and child safety lock, safety locking system for turning and tilting and turning inward opening windows. Safely ventilate the room and bring in fresh air. Easy InstallationThe window locks are easy to install. Each screw comes with 2 screws, you only need a simple screwdriver to screw it in, easy to use, no need for a drill to drill. Scope of ApplicationThe window stays for sash or double-hung windows. Allows you to lock windows open at 4 different opening angles and prevents accidental slamming. Suitable for all common windows and doors made of plastic, wood or metal. Specification: Material: Stainless Steel Color: White Quantity: 8Pcs Package Includes: 2 x Windproof Hooks 2 x Fixed Hooks 4 x Screws How to install? 1. Mark the place with a marker 2. Take a screwdriver and drill the screw into the windproof hook 3. Remove the original window handle or install the mounting hook into the door handle before installing the window handle, no need to drill extra screws 4. Mount the original door handle and you're done