On Tuesday, September 12, 2017 at 9:25:48 AM UTC-4, micky wrote:
Some of the screws I use are not attracted to magnets. What are they
made of?

The last bunch were heavy duty sheet metal screws, that came with a
license plate frame, and I kept dropping them behind the grill, and the
way the plastic bumper is made, they don't fall out. And my magnet on
a stick didn't work!

Kryptonite