Review on StarTech.com Universal VESA LCD Monitor Mounting Bracket for 19-inch Rack or Cabinet - TAA Compliant - Cold-Pressed Steel (RKLCDBK) by Doug Davis

As others have said the threads to assemble the actual bracket are either wrong or can't be screwed in because they are colored after threading. I was able to get one of the included screws just fine, which tells me it's probably not a problem with the actual threads. The mount I received didn't match the instructions exactly (I have slots, not holes) so this could be a new design change issue.