150 pc Steel Rivet Nuts Assortment in 6 popular sizes M3 - M10. Compatible with fittings of the proper thread size. Package Contents: 40x Steel Rivet Nut M3x9 mm 35x Steel Rivet Nut M4x11 mm 25x Steel Rivet Nut M5x13 mm 25x Steel Rivet Nut M6x15 mm 15x Steel Rivet Nut M8x18 mm 10x Steel Rivet Nut M10x21 mm