Usage Tips:Security Lock & Child ProtectionThe Window Handle is Equipped with a Lock and Key, can be Used as a Security Lock / Anti-Theft Device, can be Rotated 360to Open / Lock The Window Door by Opening or Closing, Tilting, Effective Anti-Theft Protection, Protecting Babies and The Elderly People. . Product SizeThe Spindle Width is 7mm 7mm Square, The Spindle Length is 35mm, and The Screw Hole Spacing is 43mm. The Spindle can be Ground and Truncated with Tools, in Order to Meet The Needs of Use. It is Suitable for Plastic Windows, Aluminum Windows, Wooden Windows, etc, Which Open Inward and Outward. . Easy to InstallEach Handle Comes with 2 Keys and 2 Screws, Which can be Locked on Any WindowEasy and Convenient to Install, Installation is Complete with Just a Hole Punch and a Screwdriver. Add More Security to Your Home, and Make Your Life More Convenient and Safe.