Aluminum Alloy Material: The sign standoff screws are made from aluminum alloy, with a sandblasted coating on the surface. They offer high strength, scratch-resistant, wear-resistant, corrosion-resistant, and a long service life. Easy Installation: To install, Install the plastic expansion tube on the wall and align the standoff screws with the pre-drilled holes on the mounting surfaces, secure them by tightening the screws until they are firmly in place. Wide Range of Uses: It is great for hanging items in the company, office, store, shops, and bedrooms, such as glass signs, acrylic signs, acrylic plates, acrylic picture frames, indoor and outdoor advertising boards, and photos. Careful Handling: When installing the screws, ensure that the surfaces are clean and free of debris to ensure a secure fit. Material: Aluminum Alloy Color: Rose Golden Total Size: 7 x 77 mm / 0.3"" x3"" (D*H) Base Hole Diameter: 7 mm/0.3"" Base Height: 70 mm/2.76"" Thread Size: 4 x 9.9 mm/0.15"" x0.39"" (D*H) Applicable Thickness: 3-11 mm 4 Pcs Standoff Screws 4 Pcs M4 inner hole self-tapping screw