Backer Plates Double 48 Pack DragSpecialties_Shocks Style: Tie On Color:Tuerca Del Eje Del Piñón Del Motor Del Lado Del Volante Style: Tie On Ancho del marco: 145 mm Diameter Thread Size: 8 mm (5 16") Radial lobe shape means the weakest flat corner areas of standard backers are reduced so the corners do not bend like standard backers