BIT SIZES FOR ROLL PIN SCREW HEADS
 

Tom,

I found two bit sizes needed checking several screws. You can buy these individually from Brownells so you don't have to buy the entire set:

340-5 (.340 shank diameter- .040 blade thickness)

300-3 (.300 shank diameter - .030 blade thickness)

I would buy a couple of each if I was going to make a habit of this.

Thank you sir for your time.
I will order a few today.
Tom