Made of aluminum alloy and stainless steel. The sliding window locks with keys are strong and durable, sure to last for a long time. Make sure the window rail heights is more than 0.6''(1.5 cm) and thickness is no more than 0.63''(1.6 cm), not applicable to the middle track of the window, please check your window track before buying. Our sliding window locks are necessary items can be used to prevent burglars and thieves, and avoid falling accidents by keeping the windows opened or closed. while protecting the safety of the family, it can also improve air circulation. Convenient to install: each lock is equipped with hex key, spin the key slowly through the hole, just holding on the track by key control, There is no need to install and disassemble with additional tools, easy and convenient to install and disassemble. Can be easily applied to most environments; By keeping the windows partially open and closed, the burglar-proof and thieves can prevent children from falling and protect the safety of their families while improving air circulation., Weight: 0.3527396192 pounds, Manufacturer: dingchimo