XT AUTO 30pcs Stainless Steel M12 x 1.75mm Thread Repair Insert Kit Compatible Hand Tool Set for Auto Repairing

Worked for me on an aluminum valve cover, ignition coil hold down bolt hole. Just be really careful when drilling aluminum not to go any deeper than the original hole ( use a toothpick or something as a gauge and mark the bits with good tape for a depth guide) ,because over doing it is really easy to do. Then when tapping be careful to stop when deep enough, you don't want to botton out in a blind hole and ruin the threads you just ran. It's a nice feeling to know these new stainless steel threads are stronger than the original aluminum ones ,that i stupidly stripped. Watched 4-5 youtube videos on helicoils. I wouldn't run a tap with a drill though, no way.

I really liked the price point for the complete set. It worked perfect for fixing the threads an exhaust manifold. The twist drill bits, wrench, thread tap and breaking pin tool worked as well as can be expected for a product cost $10.14. I drilled out and tapped both bolt holes on the cast iron exhaust and the drill bit and thread tap did not appear to suffer any wear or damage.I made the choice to purchased Nitronic 60 Stainless Steel 9mm Thread Inserts from McMaster-Carr. However, I am sure the 304 stainless steel ones that came with the set would have worked fine.I certainly recommend purchasing this set, especially if it won't be used on a daily basis.

Worked perfect on aluminum, havent tried on steel yet.

Don't be put off by the price compared to other products on the market. This kit works perfectly well as long as you take your time, know how deep you need to drill while leaving room for the tap to get sufficient space for the helicoil. I needed to fix 2 coil bolt hold downs on a 2003 Camry which were stripped during a spark plug change. Use some oil when drilling and taping and compressed air for clearing out the holes. The first helicoil wouldn't seat properly so I removed with pliers, rechased the hole with the tap and the second helicoil went right in with no problem. On the second hole it took 3 helicoils to get a good one to seat properly. So the saving grace with this kit was that there's 25 helicoils included. They all looked good so I don't quite know what the problem is with the quality of the helicoils. All in all the job got completed and I'm satisfied with the results. As I said the kit works fine as long as you take your time and know when to stop drilling and taping.

I was forced to redo a head on an ATV because someone doesn’t know what torque specifications are. These worked out amazing. Head is back on, torqued properly. Coils are holding strong. I used a bit to permanent thread lock for extra security. Should hold out longer than the ATV.