It is very suitable for hotels, dormitories, apartments, short-term rentals, bathrooms, bedrooms or private rooms. It can be used to prevent strangers from entering and is a good guarantee for the safety of yourself and your property.Iron + rubber; Window stopper are covered with rubber, effectively increase the friction for the better use and would not damage or scratch your window and avoid any annoying noiseDesigned for horizontal sliding windows, Not for vinyl windows; Total length: 2.36"; Width: 1.57"; Height: 0.59"By adjusting window stopper knob; Fit on window track spacing from 1.02" to 1.69"; Track high more than 0.59", in case affecting the stability of the security lockThis product may not be installed on some sashes, please check the instructions on the back of the product.Fastening this product too tightly may result in deformation of the window sash or .Fit window no wider than 1.6".Specifications:Size: circa 6x4x2.4 cm/2.36x1.57 x 0.94inPackage Included:1X Window StopperThank you very much for your trust and support! Here also solemnly declare to you that our products are absolutely 100% brand new in quality. If you have any problems with the products, please contact us in time, and we will solve them online for you 24 hours!