Set of locks for sliding windows: You will receive 4 pieces sliding window lock. Size specifications: The sliding window lock consists of a hex key, a lock body and a lock cylinder; the total length of the hex key is 49mm, the size of the lock body is 30*24*24mm, and the diameter of the lock cylinder hole is 10mm. Material made of aluminum alloy: these window locks are made of aluminum alloy, thickened material, anti-corrosion and anti-rust, not easy to deform, Easy to install: no punched window lock, the design of the yellow plastic handle gets you started better. When installing, just insert the hex key into the hole, determine the installation position on the window rail, turn the key to adjust the window lock to fix it and the installation is quick. Wide range of applications: Sliding window locks are suitable for all kinds of sliding windows and sliding doors to improve family security. (Noticed : Does not apply to the middle window track) Due to factors such as manual measurement and display differences, there may be slight differences between individual products and images , please excuse me.