Phillips, JIS, and Pozidriv screwdrivers demonstration

Why do some cross-head screwdrivers work better than the others? How to tell the difference?

Contents:
00:00 Phillips screwdriver design
01:41 Phillips VS JIS screwdrvier demonstration
03:03 Phillips VS Pozidriv explanation

Related article:
https://bike.bikegremlin.com/10583/phillips-vs-jis-vs-pozidriv/

The test was done without exerting any force DOWNWARDS on the screwdrivers, just turning them, while letting the gravity provide all the downward force.

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