Premium material: Our window locks are made of plastic steel, sturdy and rustproof. Comes in a set of 2. Complete accessories. Angle adjustment at any angle: window blocker for tilting window or casement window. Allows you to lock the open window at different opening angles and prevents unwanted slamming. 【Protect children and pets】Equip all your tilting windows that need special protection with tilt regulators. This way, you protect your children and your cat from injuries caused by tilted windows or ensure fresh air circulation even in windy or rainy weather. Window protection: With this window lock, you can prevent windows from blowing up in windy / stormy weather. The knob is tightened to adjust the opening position of the bracket.