High Quality: Made of aluminum alloy and stainless steel which is sturdy and durable Size: One-hole limiter - 3 x 2.4 x 2.4 cm. Double hole limiter - 6 x 2.4 x 2.4 cm Easy installation: no punching installation, card installation, no punching, easy replacement, no other tool installation. Safety: To prevent children from sharp falls, avoid children accidentally opening the window accidentally Wide application: sliding window locks can be easily applied to most environments, such as patio doors, sliding glass doors, sliding windows of hotels, residences, hospitals, schools and offices to provide children with a safe environment. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received Delivery Quantity: (according to the main image)