The sash window blocker; is effectively a heavy duty door blocker and sash window lock. This is a must-have accessory for your home to add security and prevent intruders from accessing your front door, other exterior doors or windows. This is possible by preventing the lever of the door or window leaf. CHILD SAFETY LOCKS: These door and window locks protect curious children from unlocking the sash blocker and opening the window or door on their own, helping to keep your child safe when they are out of sight. SECURE LOCKED ARM: The sash lock features a durable locking arm that does not move out of position once locked in place with the key (i.e. it acts like a door lock with key). This ensures complete security, providing additional resistance against forced entry. FINISH: These sash blockers are made of high quality cast zinc for strength and durability. They are finished in pure white to match the most popular color of frames in The slim design provides a clean look that won't detract from your home decor.; Note: The data is manual measurement, please allow 1-5cm error, due to differences between light and screen, there will be some color difference, the specific received in kind prevail.