CSPARKV 4 Pack Aluminum Sliding Window Lock, Adjustable Frame Security Lock for Sliding Door with Keys

Upgraded Double Glazing Locks - Double glazed locks can be applied to heavy doors or windows for added security. And it will be more solid, strong and sturdy, exquisite workmanship, aluminum alloy frame and stainless steel screws that can be reused for many timesQuantity and Size - Double sliding window locks with 4 keys; approximate volume 6 x 2.54 x 2.4 cm 2.36 x 0.95 x 0.95 inch (LWH), apply to track heights greater than 1.2 cm 0.47 inch, track thickness not greater than 1.6 cm 0.63 inch (not applicable to the middle track) window, please check your window track before purchasing)Easy to install - no need to install additional tools, it has a hex key in each window lock, held by a key control on the track. Designed for vertical horizontal windows and sliding glass doors; Not for plastic window framesWide use - can be easily applied to most environments; By keeping windows partially open and closed, anti-theft and anti-theft devices can prevent children from falling and protect the safety of their families while improving air circulation