About This Item. Composition Structure Each advertising screw holder consists of two silicone washers, a small screw, a screw rod, a base and the tube expansion plastic. Its screw shank cover diameter is 19mm, the screw shank is 23mm, its screw shank cover height is 5mm. The small screw is 19mm, the height of the base is 20mm. They can very well be mounted on the wall. Delicate Panel The advertising screws are very exquisite. The surface treatment of steel wire drawing process has a strong feeling of metal, it can ensure that its surface is durable, and it has the beautiful appearance. It has the advantages of anti-wear, anti-oil, anti-fouling. Excellent Material The advertising nails are made of high quality stainless steel, not easy to rust, finish and the texture are good. They are sturdy and durable. And they have a long lifespan. Easy Install The advertising fixing screw is easy to install. You just need to fix the expansion tube to a wall or a wooden plate, then the bottom of the advertising nail is fixed to the wall with screws, then put on the glass, finally tighten the screws, everything is perfect. Large Application The wall advertising hanger can be used to attach signs, billboards, construction signs, glass, photos, etc. Perfectly suited for school, office, home, supermarket, etc. If you have any questions about the product, please feel free to contact us. We will respond to your email within 24 hours. See more details.