Not limited to billboards fixation, it can also be used for the installation of decorative items such as picture frames Adjusting screw length to clamp glass / acrylic of different thicknesses Make of stainless steel, rust and resistant, ensuring long term use These Screws have complete accessories, and beautiful installation, and can be used in a variety of scenes, suitable for glass, doorplates, billboards, posters Double layer cushioning pad, effective nonslip and shockproof, cushioning fixed fit without slipping, Manufacturer: RGYBAO