closures pleasant to the touch. I like the double anchor holes in the base. Supplied with 8 self-drilling grommets and 4 screw/nut/washer kits to screw onto the solar panel. Used for flat mounting solar panels on the roof of a cargo trailer. I used 1/4-20 bolts instead of the included through-roof trailer latch bolts, but that was just personal preference. I think it will take a while! They currently contain 40W panels. Happy with this purchase!