Could someone tell me the length size?

The small one is 2 3/8" long, the large one is 3 1/4" long

How do you read/use these, does d1/8 s10-5/16 means use 1/8 drill bit in s10-5/16 sized bolt? would this work for a broken m6 bolt?

Yes, drill means the size of drill bit recommended for that size bolt. For a 6 mm it should work. Use a drill that will leave enough of the bolt to wedge the extractor in to it. Use a center punch to center the broken bolt to be drilled, drill down enough to gain as much surface as you can. Hope this helps, good luck. If you can heat the area that will help too.

I've never used a screw extrator. How do they work?

Depending on fastener size, you may also be able to use a socket (SAE or metric) with a breaker bar to remove it. I would suggest using a breaker bar (non-ratcheting), as you won't mess up the ratcheting mechanism if you really have to lean on it. Another suggestion is to use the next size up on your breaker bar (i.e., use a 1/2"-drive breaker bar instead of a 3/8'-drive breaker bar). That way, you have more length and muscle to remove a stuck fastener, and no chance of damaging a ratcheting mechanism. At a minimum, use the breaker bar to LOOSEN a stuck fastener first, THEN proceed with the ratchet to speed removal. Finally, if you're having trouble removing a fastener, even with the breaker bar, check to see if epoxy was used to hold it together (or to discourage removal). If it's epoxied, apply a few drops of a solvent (like nail polish) to make the job easier. If you are able to use heat, avoid using solvents, which may start a fire.

Description says "china". image shows "usa". which is it?

The Mayhew Tools 37332 Pro 5-Piece Screw Extractor Set is made in the USA and includes a lifetime warranty. Hardened steel edges allow for easy removal of damaged screws. The fluted cutting edges cut into the screw shaft to remove the screw. The Mayhew Tools 37332 Pro 5-Piece Screw Extractor Set includes Screw Extractor D1/8" S10-5/16", Screw Extractor D3/16" S3/8", Screw Extractor D15/64" S7/16", Screw Extractor D5/16" S1/2"-9/16", and Screw Extractor D3/8" S5/8". Sadly, third party sellers have combined their offer with the manufacturer's, and have provided misleading information about the item. Multi- packs and "improved" or "new version" offerings on this item are provided by 3rd party sellers. To ensure that you're receiving the original, authentic item, combined with Mayhew Tools excellent customer service and lifetime warranty, be sure to choose the original 4-Piece or 5-Piece Extractor Sets from Mayhew Tools. Under the "Buy Now" button, look for the "Ships from" and "Sold by" Amazon. com to confirm that you're choosing the authentic Mayhew Tools offer directly from the manufacturer.

Manufacturer	Mayhew
Part Number	37332
Product Dimensions	9.65 x 7.62 x 1.02 cm; 127.01 g
Item model number	37332
Size	5-Piece
Colour	Black Oxide Finish
Material	Blend
Power Source	Hand Powered
Item Package Quantity	1
Number of Pieces	5
Number of handles	1
Included Components	36962 Screw Extractor D3/16″ S3/8″, 36963 Screw Extractor D15/64″ S7/16″, 36964 Screw Extractor D5/16″ S1/2″-9/16″, 36965 Screw Extractor D3/8″ S5/8″, 36961 Screw Extractor D1/8″ S10-5/16″
Batteries included?	No
Batteries Required?	No
Item Weight	127 g

Pro 37332 Screw Extractor Set, 5-Piece, Black

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