Gridless Revolution magnetic solar panel mounts are perfect for mounting a standard solar panel on steel, galvanized steel, or any other ferrous metal. With up to 175 lbs holding force per bracket, they live up to the heavy duty Gridless Revolution design requirement. Mount your panels fast and easy, or be able to remove them quickly with just magnets. No unnecessary drilling required through your roof! Perfect for permanent or temporary installations. Includes safety tether to prevent panel from sliding. Each mount is rated for 175 LBS holding force* (4 minimum recommended per solar panel, 4 x 175 = 700 LBS total). Many different mounting possibilities. Assembled and quality checked in USA from domestic and foreign parts. What's included: Pre-assembled solar panel bracket(s), with stainless steel hardware 6" Safety tether to prevent brackets from sliding. Stainless steel 1/4" bolt(s), washer(s), and locknut(s) for mounting the bracket to your solar panel (1 set per bracket) *The mounts are rated for 175 lbs each using 3/16" thick carbon steel. If your sheet metal is thinner, this rating will be reduced. If you have paint between the mounting surface and the magnetic solar panel mount, the rating will be reduced. And lastly, the 175 lb rating will also be reduced if you are mounting on a curved surface, such as a car or truck roof. If you aren't sure if our magnetic solar panel mounts are a good solution for your application, our suggestion is to try them out and if they don't hold up to your expectations, we accept free returns within 30 days. Always use the supplied safety tether. Gridless Revolution cannot be held responsible for any damage or personal injury caused by the use/misuse of this product.