Where was product made

Product description says “China”

what sizes are these?

From the actual package label (on the back):To Remove This Size-------------Use This--------Use ThisBroken Bolt,----------------------Extractor:-------Drill:Screw or Pipe:3/32" to 5/32"----------------------EX-1------------5/64"5/32" to 7/32"----------------------EX-2------------7/64"7/32" to 9/32"----------------------EX-3------------5/32"9/32" to 3/8" & 1/8" Pipe------EX-4------------1/4"3/8" to 5/8" & 1/4" Pipe-------EX-5------------19/64"5/8" to 7/8"------------------------EX-6-------------3/4"Note that the package marking disagrees with what is etched on the side of the EX-6 bit. The etching says drill size 13/32", not 3/4".

Are any of these big enough to remove a 1/2 inch fine threaded left hand bolt?

Yes, most of the sizes are for larger than 1/2 inch, but the two smaller sizes will work. I find that using an automatic transmission fluid and acetone 50/50 mix helps. Apply before attempting to remove screw and tap on the screw lightly.

Dumb question, but what’s the best tool to attach to these extractor bits? I planned to use my Dewalt impact driver but not sure how to attach.

Drill into the center of the broken screw or bolt with the appropriate size drill bit. Tap the extractor into the drilled out hole in the bolt. I use an adjustable wrench to turn the extractor to remove the bolt. You could probably use a T-handle tap wrench if you have a tap and die set. I'm not sure if you would want to use a power tool with these extractors.

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🛠️ Break free from broken bolts with precision and ease!

BUILT IN SIZE GUIDE - Each tool is etched with its size and recommended drill bit for quick, accurate work.
LIGHTWEIGHT COMPACT - Easy to carry and store, perfect for on-the-go professionals.
TRUSTED BRAND QUALITY - From アーウィン (Irwin), a name synonymous with durable, reliable tools.
ALL IN ONE EXTRACTION SET - Six sizes (1-6) cover a wide range of broken fasteners for versatile use.
PRECISION GRIP TECHNOLOGY - Left-hand spiral design ensures a secure, slip-free extraction every time.

The Hanson Erwin HA53545 Set of 6 Spiral Screw Extractors features a left-hand spiral design for superior grip on broken studs, bolts, and socket screws. Each extractor is etched with its size and recommended drill bit, ensuring precise and efficient removal. Lightweight and compact, this set is ideal for professionals seeking reliable, versatile extraction tools from the trusted Irwin brand.