Rugged Gear's Adjustable Screw Mount Double Hook is for permanent installation for horizontal mounting on walls, in utility vehicles, toolboxes or out-of-sight locations such as under trunk lids. Its easy to install with self-drilling screws or with bolts, nuts & washers (all included). This model mounts to any secure interior location that accepts bolts or screws; on roofs, in vans or trucks, boats, golf cars, off-road vehicles, specialty hunting & shooting vehicles, trailers. It you to adjust the space between the two hooks for greater flexibility. The mounting bracket is made of powder coated steel.