Hard to find longer metric screws.
Available in 3mm, 5mm, 8mm, 10mm or 15mm lengths. 10 per package.

All of our screw back conchos come with a M4-.7 x 4.5mm machine screw.
If your project requires a shorter or longer screw, here's a selection that might fit your needs.

Here's what the description means…

M = Metric thread designation

4 = Nominal diameter, in millimeters

.7 = Pitch (distance from thread to thread), in millimeters

4.5 = Length, in millimeters 

Available in 3mm, 5mm, 8mm, 10mm or 15mm lengths.