Solarix Rail Nut to Bracket Mount Kit Pack of 4-Includes 4 x 2.1mm Rail Nuts, 4x M8*25 Bolts , 4x Spring Washers, 4x Lock Washers, Used To Secure The Solar Panels To The Mounting Rails, Suitable For Pitched And Flat Roofs, Cladding Type: Tiled, Slate And Sheet Metal Roofs, Sold As A Pack Of 4, OEM Packaging Retail Box, No Warranty