Durable material: the brackets are made of iron material, durable and sturdy, not easy to break or deform, can last for a long time use, suitable for both internal or external installation The Vertical Blind Bracket (1-1/2 Inch Headrail) (Inside Mount) is a vertical blind mounting bracket for vertical blinds with a 1-1/2"(38mm) wide headrail or track only. Package: 4pcs White Color Brackets For Window 3.5"(89mm) or 5inch(127mm) Blinds (not include the screws installed to wall) The mounting brackets features slots for fastening to the mounting surface inside of frames. Designed for vertical blind head rail measuring 1-1/2" wide across the top only. Please kindly check the size on the picture and make sure it can match your device before order.