Reddit reviews M4 x 6mm Thumb Screws Plain Type Metric (Thread Dia. 4.0mm) Knurled Head
We found 1 Reddit comments about M4 x 6mm Thumb Screws Plain Type Metric (Thread Dia. 4.0mm) Knurled Head. Here are the top ones, ranked by their Reddit score.
M4 x 6mm thumb Screws,Thread Diameter 4mmStainless Steel 303Extra large head with Stright knurlAll the screws are fully threaded.
I'm sure this isn't the right size, but I found this on Amazon just searching "metric thumbscrew." As long as you know the size and thread pitch you should be able to find something.