For your information here are the required drill hole sizes for the appropriate rivet nut:
M3 rivet nut: drill hole size: 5.0mm
M4 rivet nut: drill hole size: 6.0mm
M5 rivet nut: drill hole size: 7.0mm
M6 rivet nut: drill hole size: 9.0mm
Package include:
40 x M3 x 9mm
40 x M4 x 11mm
20 x M5 x 13mm
20 x M6 x 15mm
