There is no need to install extra tools,it equips a hex key in each window locks,holding on the track by key control.
It is strong,solid and sturdy,exquisite workmanship,aluminum alloy frame and stainless steel screws that can be took full advantage of many times.
It 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.
Size: (L*W*H)24mm*30mm*25mm, hole diameter: 10mm
Material: aluminum alloy and stainless steel
Quantity: 8 pieces
Note: If your window track is in the middle of the window, you can't use the window locks