Solar Panels Mounting Z Brackets Mounts Kit for RV Boat Off Grid Roof,38mm Width,Support Solar Panels Up to 80W Made of rust-free anodized aluminum alloy, bolts, nuts and washers are stainless steel. 1/4" diameter stainless steel bolts (1/2" long), lock stainless steel nuts. Maintenance Free & Easy Installation. Solar Panel Z-Bracket Mounting Kit makes it easy to mount solar panels to RV's, boats, cabins or anywhere else where you need a simple yet reliable method to mount solar panels. Comes with 4 Z brackets, 4 of each Nuts & Bolts,4 Washers,4 Lock washers.