Upgraded Double Glazed Locks - Double glazed locks can be applied to heavy doors or windows for increased security. And it will be more strong, solid and robust, exquisite workmanship, aluminum alloy frame and stainless steel screws that can be reused many times

Quantity and Size - sliding double window locks with 4 keys; approximate volume 6 x 2.54 x 2.4 cm / 2.36 x 0.95 x 0.95 inches (LWH), applied to track heights greater than 1.2 cm / 0.47 inches, track thickness not greater than 1.6 cm / 0.63 inches (does not apply to center track) windows, please check your window track before purchasing)

Easy to install - no need to install additional tools, it has an Allen key in each window lock, held by a key control on the track. Designed for horizontal/vertical windows and sliding glass doors; Not for plastic window frames

Wide use - can be easily applied to most environments; By keeping windows partially open and closed, burglars and thieves can prevent children from falling and protect family safety while improving air circulation