Originally Posted by rvenneman
... By the way, what kind of crazy screw head are used on those screws.. Strangest thing I ever saw..... :-)
They are called Robertson screws and are a Canadian invention! Apparently they are preferred because the screw seems to stay in place on the screwdriver bit making them easier to install.
There are 3 common sizes and the corresponding screwdriver has a colour-coded handle (yellow - #0 small, green - #1 medium, red - #2 large). The ones on my trailer that I've worked on use Bit #2.