This product mounts on a windshield. We suggest attaching with stainless steel rivets, or if the aluminum is thin try to use a short #10 screw with the point filed off. Be sure to order stainless steel deck hinges to work with stainless steel eye ends. Cast Type 316 Stainless Steel. Length 2-5/8" Bolt size 1/4-20. 2 Hole Windshield Side Mount with bolt.