I have yet another(!) electronics' modification project going, and ran across a slight dilemma: None of my several "Security Bit" sets have a bit that fits the Tri-Point (or "Y") screw heads in the gear to be modified, even though 2 sets do have Tri-Point bits. However, I found this screwdriver set on Amazon: https://m.media-amazon.com/images/I/5113Evt3D0L._AC_SL1000_.jpg The question is, looking at that image, are those the correct diameters for the "Y" designation given? Basically, the 3mm for example, would be very close to the circumference of the outer circle the "fins"* of the bit would define. I ask this question because...