This is what I have, Cornwell, they have worked well for me. I have also done the 'weld-on something,' and left-hand twist drills. I just choose the one I feel most-confident is gonna work, this time. I've also used a cold chisel on button-head allen screws where the allen screw socket rounded-out. PB Blaster and heat are usually prep steps for any effort.
Here's a metric allen screw on a SOHC Honda 750/4 brake caliper, the drill press did this one. I probably could have soon-switched to the Cornwell extractors, but I just kept drilling. By the time I got to this point, it came-out easily with very-little effort.


Speaking of 'stuck things,' when I get a brake caliper which won't release the piston, I fill it with grease through the bleeder, I've yet to lose-out on this method, if an airhose doesn't pop it-out. Bonus pic of some 40+ year-old crud inside the caliper which shows how-nasty the thing can-get.
And finally, if the banjo bolt is in-line with the master cyl piston, like it is on SOHC Hondas, here's a cheap tool I came up-with, to drive-out a stuck master cyl piston. It works like a charm. It was featured awhile ago as a reader tip in 'Cafe' Racer' magazine. Not this issue, but if you're into old crocks, this has lots of interesting material, how-to's, and parts sources.
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