Thinner Than Standard M8 Nuts Which Are 13mm ATF. 10mm Tall - Taller Than A Standard M8 Nut. Thin Wall 11mm Across The Flats (ATF) Design - Fits 11mm Sockets & Spanners. 11mm Across The Flats (ATF). Ideal For Use On Performance Inlet And Exhaust Manifolds Where Tooling Access Is Tight For 13mm ATF Tools.
