This sliding window stopper lock is suitable for homes and offices. The sliding window lock can maintain indoor air circulation while avoiding the hidden dangers of children and pets climbing on windows. What's more, it can keep thieves out. Our window locks are very small and convenient to carry to other places where you need our window locks. Portable, easy to move from window to window or take it with you. The sliding window lock is made of aluminum alloy, durable and rustproof, reusable. The sliding window lock consists of a hex key, a lock body and a lock cylinder. Each window lock comes with a hex key. You can use an adjustable wrench to slowly turn the nut to secure it to the window track. Installation only takes 5 minutes. Sliding window locks can be easily applied to most environments, such as patio doors, sliding glass doors, sliding windows. 'hotels, residences, hospitals, schools and offices to provide children with a safe environment. Specifications: Size: Hex key: 49mm x 5mm Lock body: 30mm x 24mm x 24mm Lock cylinder opening: 10 mm Material: Aluminum Alloy Color: Silver, Yellow Quantity: 4 pieces Features: Made of aluminum alloy, thickened material, anti-corrosion and anti-rust, not easy to deform. It is not necessary to install additional tools, it equips a spanner hex in each window lock, holding on the track by key control. Adds more security ty to your sliding doors and windows to keep you and your family safe inside. Suitable for sliding doors and windows, such as courtyard doors, sliding glass doors, windows sliding windows etc. Package includes: 4 x sliding window locks Notes: Please confirm the height of your window/door rails at least 1.5cm/0.6inch, the thickness of the rail no more than 1.6cm/0.63inch. Not applicable to middle window rail, it is necessary to check your window rail before purchasing. Due to the manual measurement and different monitor settings, please allow a slight error in the size and of color.