[RKDinOKC]

When my vision was knackered often used my iPhone as a maggot frying glass. Used to have an app for that too. Thankfully I can see much better now, May need to resurrect the app to be able to read fine print though.

That hex key is tiny, but .050 mm? That would be .0019 inches. There are plastic tarps for painting thicker than 2 mil. A typical English hex key set goes from .050 inches to 3/16 inches so going to confidently say inches.