Just like metal screws, but made of nylon, meaning your modules are safe from being rashed up! It's what we use at the shop to rack our modules to keep them nice and pristine!
Depth: 6mm
Most racks will typically use m3 screws, if you are able to use the screws that come with modules, you use m3 screws. Make Noise cases and other sliding nut rails use m2.5