Screwed!

Try to use a Robertson and you will absolutely destroy the screw. That shot of the screwdriver tip fitting the screw precisely is what is important.

The screws are TERRIBLE quality. The WiHa screwdrivers in the link utilize every last load bearing surface of the screw head. Trouble arrives when screws arrive so tight loosening them is next to impossible.

I have a full set of WiHa Robertson screwdrivers and I would love to read where someone thinks they do not work in these morphidite screws because they (the tools) are inferior.

Yes there ought to be a law they have to use Robertsons. First time I ran into them was in a Canadian built truck camper. None better. Best part is the screws stick to the driver for ease of putting in tight places.

Screw heads are designed for:

US Phillips and
CDN Roberson (square)

screwdrivers. Robertson screwdriver would be the best of the two.

http://www.robertsonscrew.com//

I thought perhaps it was for the ferrules so one need not sever or splay copper stranding with a set screw.

Sheesh, that's more a picture of a buss bar for sale than the screwdriver.