Problem Solvers Sheldon Fender Nuts Set - 13mm Front and 10mm Rear Standard 6mm brake nut with longer internal threading and extension on the back for a M6 bolt Includes a 13mm front brake nut and a 10mm rear brake nut Ideal product for commuters, especially in wet climates; makes installing and removing road fenders very easy Standard 6mm brake nut with longer internal threading and extension on the back for a M6 bolt