What would be the best method to remove a stripped drain bolt?

Thanks!

 

I've used many different extractors,but these have been the best. Still have them. You can get these at just about any good hardware store,tool trucks,Sears,etc.

 

Awesome, thank you!

 

What are they called exactly?

 

Bolt/screw extractors. Here's the three major types of extractors. First two I have and are the best. First set can grip a stripped bolt head and remove it.Second set is also good for small and large screw and bolts.https://humblemechanic.com/2012/07/1...-uh-oh-drawer/ Reasonably priced at Sears,Harbor Freight and Northern tools along with some good hardware stores. Also on the tool trucks,Mac,Snap On,Cornwell,but better quality and premium priced. Home mechanics can get by usually with the cheaper store sets.