Metric Helicoil Thread Repair Kit: 131-Piece Heli Coil HSS Drills Inserts Taps & Tools M5 M6 M8 M10 M12 Automotive Engine Spark Plug Cylinder Insertion Rethreading Tools Universal Rethread Restorer

Firstly, this comes in a metal case, which is very welcome.I’ve used this a few times now and had no problems. The drills have worked absolutely fine, the taps too. No problem fitting the inserts though the tang at the bottom doesn’t always break off when it should, though it’s not caused a problem.So far it has made repairing damaged threads a breeze, the installed inserts have worked great. Last repair was a coolant pipe retaining bolt on an engine. It was quick, easy, the bolt went in first time after the repair was made and no leaks.Highly recommended!

This is a great kit that has pulled me thru some tough repairs on internal threads!There are way more inserts than I will ever use but it’s great knowing I am covered in the instance that I might need one for an emergency!I repaired a few threads in my motorcycle subframe that seem to always be a problem when threading in steel bolts into an aluminum frame! Worked great and saved me from a trip to the dealership for a more expensive repair. I have also used them to install handles on my tractor and made a cue ball shift knob for my car with the inserts. For anyone curious, pool balls need helical insert or the bolts will shatter the threads!Kit comes with the appropriately sized drill bit, helicoil specific Tap (this is not a regular thread sized tap), helicoil Installation tool, and helicoils in several sizes.I Highly suggest this kit to any mechanic or DIY person because sooner or later you will need it!

I would recommend this product. I bought 2, this being the better one. Used it on a 799 ls exhaust stud that was broke off inside & it had a broken hardened milwaukee bit inside. Sadly I couldn't keep the same stock size exhaust bolt. Had to go 1 size bigger but that Chinese drill bit ATE thru everything & whole process took 5min. So in the end a junkyard run would be 70 plus gas & new head to much $. But now I have a kit & new skill unlocked.

Had to replace my header helicoils, the drill bit is great and the insert tools are easy to work with. Would recommend!

Works ok. The drill bit need to be tapped so they can fit in a modern drill. The sharpness and it's ability to hold an edge are questionable. But still got it done with a few bits from DeWalt and Irwin.

Only used the M6 coils so far, but they worked great. All the required tools in one kits is excellent, and a decent quantity of each size mad installation a breeze. My first time students had no issues installing in minutes.

Exhaust on the riding mower was coming off due to the threaded holes for it being stripped out. I didn’t want to tap the holes to a bigger size bolt, and I didn’t want to have to weld the exhaust to the mower. Just happened to stumble across this, read the good reviews, and decided to give it a try. Couldn’t be happier! They worked better than I could’ve hoped. Easy to use and it seems that they’ll be more durable than if I had tapped the holes bigger. Can’t go wrong with this kit.

Great value. Decent quality, worked great on my repair. After over 300 miles on the engine I used this since it was rebuilt and all is good. Very pleased.