Larry's Trailside trigger kit drill and tap size?

I plan on ordering a couple of these kits from Jim Henderson.  However he does not have any kits with the drill bit and tap.  So does anyone know what size I need to have to install it?

I personally haven't found the set screw neccessary. I used purple 222 locktite on the screw that controls the second stage and trigger stop. It's been fine for well over a year on two pistols.. once you the screw adjusted you simply need it to stay put. I'll check today to see if i have the screw.from an old kit

I have the drill and tap set looks like it says 0.50

That tap looks correct. The screws i had left.over were 3mm..

If I recall, the frame on my Trailside was very hard. If there was a way to do it without the drilling and tapping, I'd look into it.

yes they are hard and that's a small drill and tap..