This set includes 106 Hexagon Cap Bolts in various sizes ranging from M4 to M10. The sizes included are: M4 x 12mm (25Pc), M5 x 12mm (25Pc), M5 x 25mm (20Pc), M6 x 12mm (10Pc), M6 x 25mm (10Pc), M8 x 25mm (5Pc), M8 x 40mm (5Pc), M10 x 25mm (3Pc), and M10 x 40mm (3Pc). The bolts feature a black oxide finish for corrosion resistance and are made of carbon steel. The head diameters are approximately 6.5mm for M4, 7.6mm for M5, 9.3mm for M6, 11.3mm for M8, and 13.6mm for M10. All bolts are fully threaded and come in a strong poly case for easy storage and transportation.