Specifications: It is strong,solid and sturdy, beautiful workmanship, aluminum alloy body that may be reused many times. There is not any deserve to set up extra tools,it equips a hex key in each window locks, keeping at the track by means of key control. Can be easily utilized to maximum environments;By protecting the windows partly open and closed, the burglar-proof and thieves can prevent kids from falling and protect the security of their families while recuperating air stream Name: Window lock Material: Aluminum alloy Color: Silver Size:25*16*11mm(0.98*0.63*0.43in),45*16*11mm(1.77*0.63*0.43in) Applicable scope: Window Package Contents: 1x Window Lock Stopper Note: Due to the light and display screen setting difference, the item's shade could also be barely varied from the pictures. Please allow slight size distinction due to different manual measurement.