4 sets aluminum alloy easy install swindow locks security sliding with key

easy to install, no need to install extra tools, it equips a hex key in each window locks. made of aluminum alloy, durable material, strong, solid and sturdy. wide usage, can be easily applied to most environments,burglar proof, protect the safety of their families, improving air circulation. eco friendly and long using life, it can rust proof and the screws that can be reused many times. package includes 1 piece of lock with key, and can be apply to heavy door