The ALSOK Lock is an auxiliary lock for windows sold by ALSOK. Features: ● The ALSOK Lock can be easily attached directly to the glass surface with adhesive stickers. ● It has two lock plates, and by locking only one, you can lock the window while keeping it open a few centimeters for ventilation. ● From the outside, the "ALSOK mark" printed on the adhesive surface of the auxiliary lock is visible, which is expected to deter crime. ● It has the effect of prolonging the crime when breaking the glass (breaking the glass near the crescent lock and reaching in to open it). Size: Width 8.2 x Depth 0.9 x Height 6 cm Note: A gap of 10mm or more is required from the outer sliding glass surface to the inner sliding door's vertical frame.