Features: Each lock is equipped with hex key, spin the key slowly through the hole, just holding on the track by key control, no additional installation tools,Comes with 2 tabletsnon-slip rubber pad to prevent scratches or damage to the window and Improve stability Quality material: Made of aluminum alloy, which is sturdy and strong, and there's a yellow plastic cover outside the key handle, can serve you for a long time. Necessary items: Open the screen window when the weather is hot in summer, which can improve air circulation, you can use the window locks to fix the screen window, it can prevent children from falling and prevent the thieves. Specifications: Size: 3 x 2.4 x 2.4 cm/ 1.2 x 0.94 x 0.94 inch (LWH) Material: aluminum alloy Quantity: 4 sets Package includes: 4 x Sliding window locks with key 1 x Vertical key 4 x Fixed bracket 8 x Non-slip rubber pad 4 x Ordinary key 1 x User manual Notice: Multiple locks can be applied to heavy window or door together to increase safety.