Fangrui Product Details Premium Material: These Solar Panel Clamps Are Made Of High Strength Excellent Aluminium Alloy Material With Smooth Edges And Great Toughness, The Is Anodised, And , Which Reduces Wind Pressure, Drainage And Sand Reduction. Easy To Install: The Solar Panel Mount Comes With Nuts And Bolts For Quick And Easy Installation. Make Sure The Modules Are Installed In The Correct Position And Alignment By Connecting The Solar Panel And Attaching To The Rail. Practical Design: Solar Panel Clamps Are Designed To Attach Modules To Rails And Create A Strong Connection Between The Modules. Compatible With Popular Framed Solar Panel Installations On The Existing Market, Making The Panels Securely Locked. Wide Applications: Suitable For Quick And Easy Installation Of Photovoltaic Solar Panels On Different Surfaces, E.g. On Van, House, Boat, Caravan Roofs, Etc. Flat Shingle, Vertical Sheet, Etc. Size: 30mm Material: Aluminium Alloy Colour: Silver Package Contents: 8 X Solar Panel Clamp Brackets Only The Above Package