EASY TO INSTALL WITHOUT DRILLING: No additional tools or drilling required for installation. Place the lock in place, insert the protective spacer and tighten the screw to secure. You can use the vertical key or hexagonal key to reinstall the lock in different positions, the window lock is easy and convenient to reuse.PACKAGE INCLUDES: 6 security window locks, 6 mounting hex keys, 6 protective gaskets, 1 vertical key for mounting to center track. If you have any issue about the window locks, please contact us. We will reply within 24 hours.VERSATILE USABILITY: Our sliding window security locks are widely used in a variety of situations, including homes, apartments, hotels, offices and more. The window lock can freely control the sliding window to partially open or completely close, preventing children or pets from accidents, preventing burglars and thieves from trespassing, the security window locks can provide you with more safety protection.MEASURE YOUR WINDOW TRACK BEFORE BUYING: Our window locks are designed to fit a wide range of vertical and horizontal sliding door windows, please measure your window track for compatibility with the locks before buying, With a track size height requirement of greater than 0.48 inch (1.2 cm) and width limitation of less than 0.61 inch (1.55 cm). Depending on the type of track, window locks can be installed on either the inside track or the center track.ENHANCED SECURITY DESIGN: 1, window lock and key separation design, to prevent children or thieves to unlock at will; 2, thickened aluminum alloy material, permanent durability and not deformed; 3, window lock two fixed hole design, so that you can experience a stronger security protection; 4, the lock body widening design, open the window when the blocking area is more solid; 5, the window lock is equipped with a protective washer, to prevent scratches or damage to the window.