This is a multi-functional sliding window safety limiter. Made of sturdy plastic material is strong and durable, anti-scratch, anti-wear workmanship. The window limiter can prevent children to open the window and and protect the safety of their families while improving air circulation. Features -Material: Plastic. -Size: About 5.20X3.00X2.40cm/2.04X1.18X0.94in. - It is not safe to open the window at night when the weather is stuffy, and it is safe to lock the window with this. - It can be used in home, office, school, hotel, and any places you can think of. - Good workmanship details, not easy to rust, sturdy and durable, can serve you well. - Effectively reduce the risk of kids, old and pets falling from heights, guard against robbery or theft. - It can be used for the window in home, office, school and any places you can want to use. Package list: 4 x sliding sash stoppers 4 x screws