You can’t really tell how big these are in pictures… they’re chunky and self-adjusting to a range of sizes. The leverage is offset from the centre, so combined with a long lever like breaker bars it should move (or snap) most things.

Damaged Bolt and Stud Extractor Tool 3/8" Drive Broken Stud Remover Bolt Extractor Fit 1/4" to 1/2" Rounded Studs for Broken, Rounded Off, Painted Over, and...
4.0

Blue Spot Tools 22307 3/8" Impact Stud Extractor, packaging may vary
4.0