Complete Set: Get 4 sliding window locks, ideal for protecting your home. Size Details: Each lock consists of a hex key, a lock body and a lock cylinder. < p>Sturdy Material: These locks are made of thickened aluminum alloy, corrosion and rust resistant, and will retain their shape over time. Easy Installation: No drilling is required to install these window locks. The yellow plastic handle makes adjustment and installation easy. Just insert the hex key into the hole, position the lock on the window track, turn the key to secure the lock, and you're done. Versatile: These locks are suitable for various types of sliding window doors and sliding doors, adding security to your home. (Note: Not suitable for medium window tracks)