Features 1. Material: Z-Brackets 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. 2. Functions: Solar Panel Z-Bracket Mounting Kit makes it easy to mount solar panels to recreational vehicles (RV& 39;s), boats, cabins or anywhere else where you need a simple yet reliable method to mount solar panels. 3. Each kit includes brackets and all necessary bolts and washers, and Outer hexagonal wrench. 4. This product is a good choice for flat mounted systems on flat or curved roofs. Compatable with all roof types and solar modules. 5. Unlike stainless steel solar mounts, our corrosion-resistant aluminum alloy mounts are lighter but stronger, support solar panels better, and have no burden on the roof. Specification Material: Aluminum alloy Color: Silver Size: 20 x 20 x 5 cm Weight: 300 g, 600 g Package Include: 1x Solar Panel Z-Bracket Set(4Pcs) 1x Outer Hexagonal Wrench or 1x Solar Panel Z-Bracket Set(8Pcs) 1x Outer Hexagonal Wrench