Material: This advertising nail is made of high-quality stainless steel. It is corrosion-resistant, rust-proof, scratch-resistant, oil-resistant, smooth, and durable. You can use it for a long time without having to replace it. The spacer is 19 x 30 mm, the nut depth is 25 mm, the screw head thickness is 5 mm, and the diameter is 19 mm. Professional Design: Our advertising screw has a unique design. The through-style design eliminates the need for a frame, making it more beautiful. It allows screws to be passed through the sign and attached to the wall for a clean, professional look. Adjustable Length: The screw cap with adjustable length makes the screw circumference wider and freer. Each nail contains two rubber gaskets, which allow the sign and screw to fit better. They protect the advertising board from scratches, are non-slip and shock-resistant, and increase friction to make it stronger. Easy to install: Our advertising nail kits are equipped with screws. Fix the base to the wall with screws. Place the sign into the round hole and tighten it directly, which is very convenient. Application: These advertising nails are very suitable for indoor and outdoor signs. e.g., companies, libraries, hotels, shops, supermarkets, exhibition halls, art galleries, homes, offices, elevators, etc. These nails can be used indoors and outdoors.