These are auxiliary locks for windows. Selling a set of 2 at a bargain price. Suitable for both the upper and lower frames, installing them on both the top and bottom of the window will further enhance security. Easy installation, no tools required. Applicable window frame size: approximately 2.8~4.2cm. ● Size (approx.): 60 x 40 x 37mm ● Materials: Zinc alloy, iron, rubber ● Uses: Auxiliary lock, window lock, theft and intrusion prevention, security goods ● Product Name: NEW Akazu no Mado (Unopenable Window) ● Manufacturer: Mitsuki Co., Ltd. ● Quantity: 2 pieces