> using a PH1 driver in a PH2 screw I see that a lot. I think people are confused by the size of the bit; the one that fits is kind of large compared to the si

> using a PH1 driver in a PH2 screw I see that a lot. I think people are confused by the size of the bit; the one that fits is kind of large compared to the size of the screw. As a side note... There's a lot of stuff out there that looks like Phillips but is actually JIS B 1012 ("crosshead.") Compared to Phillips heads, JIS heads are a little deeper, the cross is a little more square, and sometimes there's a dot in one corner of the cross. They're actually quite reliable and resistant to cam-out, provided you use the right tools.