Thread Repair Tool, File, Chase, Restore, Repair, and Clean Internal and External Thread: Male, Female, Inch, Metric and Pipe Thread (RT1) (3/8 Dia. Head x 2 Length x 1/8 Arbor) by Rotary Thread

Works great! Was really easy to use in my dremel.

Ruined the threads on a crankshaft and this fixed them

Great tool to fix and reform threards that may be damaged, rusty or very gunked up.

I bought it to use in my shop in place of a thread file. Its smaller than I expected but thats a good thing. Has been useful and effective.

I bought this to clean up the threads on a part where the threads were distorted by welding. This tool cleaned them up nicely in a matter of minutes. I also used it to clean up the rusty threads on our main drain clean-out fitting which was pretty messed up after nearly fifty years. Fifteen minutes later the threads on the drain and cap were cleaned up and the cap securely screwed on. I would suggest when working on heavily damaged threads that you stop occasionally to flush the rust or metal particles out of the threads. And no matter what, flush them out when you are done.

It fix any bad thread. Highly recommended. Easy to use.

Im not sure this product really repaired the threads. I had some threads on an M12x1.0 that were smashed in a small area that made it difficult to thread a nut. This tool is just a grinder and you need to be cautious about grinding too much. While it worked in that I could thread the nut on it was mostly due to the fact that this basically removed the threads in the spot entirely. If you arent careful you could potentially cross cut the threads. I think this may work better on larger thread pitches like 1.25+ but on fine threads like 1.0 its more difficult. The product worked but for the money a die or chaser still works better.

If you have to repair threads, this is the tool you need, my only suggestion is order the larger one, also do not add pressure to the tool lay it in the damaged threads lightly run along threads,

I purchased this tool after watching a review of a similar product on YouTube. This one is very similar if not the exact product. Works great with a high rpm impact drill. Also it does take a little getting use to at first, my suggestion is lock down whatever your working on and use two hands to control the direction of the drill as well as the recoil of the spinning bit. Also go with the direction of the drill while using. LIFE SAVER!!!

While I didnt use this exact thread repair item (I found one at the local auto parts store before this one got here) I filed both internal and external threads. The one I got at the auto parts store is the same as the one I ordered from Amazon. (kept both of them) These were 22mm left hand wheel studs and nuts, didnt know this was possible. Worked like a charm!