The window protection lock is a completely new type of simple double lock that can be easily attached with one hand to a sash window. Besides for crime purposes, it is also convenient when you need to open it for ventilation or to prevent infants from falling off. Length 3.7 x Width 3.7 x Thickness 1.6 inches (95 x 93 x 40 mm), 1.0 oz (27 g), Material: PP, PVC, Made in Japan, Note: Cannot be used on frosted glass or other glass that does not have suction cups. This product uses the power of suction cups, so please attach the very common suction cup to the window glass you are trying to install and confirm whether it will be adsorbed before purchasing.