*High Quality Material: The sash jammer is made of high-quality aluminum alloy, durable,not easy to wear. Sash Blockers Are Designed to Provide Additional Security for Your plastic steel casement Doors and Windows. *Wide Application: Suitable for uPVC windows and rebated doors, these multifunctional sash jammers use to increase protection of the bedroom door, bathroom door, balcony window. Whether your window is left or right to open, our window locks can be used. *Well Fitted:They can be used for flush windows and can be rotated 180 degrees to open both left and right. Suitable for upvc windows with a frame thickness of 17mm - 20mm. *Reinforcement Design: This window lock protects your family and acts as a burglar deterrant. The back of the lock is designed with a screw-reinforced anti-pinch arm, so that the base and the lock arm are tightly integrated, which is more durable, avoids loosening, and provides your kids and pets with more security. *Easy to Install: 4 window locks for upvc windows are included. The package also comes with mounting washers, cap covers and screws for easy DIY installation. They can be attached to your windows in just a few minutes, making them an ideal solution for secure locking., Manufacturer: FiTspi