M5 Hex Bolt/Setscrew Fully Threaded & M5 (5mm) Steel Hex Nuts Quantity - 10 Bolts & 10 Nuts Bolt Dimensions – M5 x 25 Bolts Here is what the dimensions mean… M - Metric thread 5- Diameter of the bolt, in millimetres 25 - Length, in millimetres (from the base of the bolt head to the end of the thread) Nut Dimensions - 5mm internal Diameter, 8mm external Diameter Material Zinc Plated Steel - A Corrosion-Retardant plating provides protection from external elements and extends the life of the metal used to make these 5mm bolts. Specification M5 Hex Bolts and Hex Nuts 8.8 Pitch - 0.80