90 degree drill is absolutely essential. A smaller bit was needed to step the hole up gradually. Overall, a major upgrade.

Like other have mentioned the 1/2 bit complicates things a bit. What I did was went to harbor freight and got a 90 angle drill attachment for $20. Attachment only allowed up to 3/8 so I shaved some of the bit down with an angle grinder and it worked like a charm. No need for an expensive angle drill if you’re not using it all the time.

While chanty high pressure high pressure oil pump in a jasper rebuild. The screw stripped out. Then while drilling the wholes I drilled out the crappy helicoil jasper put in. I got everything drilled out tapped sunk the inserts just below the surface and everything is working great. I would definitely recommend this product verses trying to set in helicoils

This little kit saved me thousands of dollars. My mechanic stripped out my HPOP bolts and through we have to pull the engine and replace the front cover. After lots of research I found Riffraff Diesel. With this kit we were able to fix it permanently and better than stock!

I like this over a regular helicoil. Steel insert with lock tight already on it. Would have given a 5 but the drill bit is 1/2 inch and not a common size for the average regular or right angle drill. Instructions were good. I bought a 3/8” drive bit and had to use my 3/8 inch 90 degree adapter on my drill. I removed the plenum because initially my 1/2 inch drill body had to much girth and even after removing the passenger side plenum it still touched the engine causing a slight angle. Ugh. A smaller regular or slimmer drill would have been better. Not optimal, but the adapter worked. Suggestion: get a second set of eyes to keep the bit perpendicular from the side while you keep it perpendicular from the top. So much easier. I used the stop collar as a guide with just a little of the bit showing so I could better judge alignment. Then I readjusted the stop collar after it bottomed out about three or four times till I reached the proper depth. This way the hole came out perfect. My first time doing this and it worked. The taps could use descriptions to know which one to start and which one to finish. I googled it. Use 1/4 inch ratchet, easier to handle. HPOP back on and running strong. Thanks for another great product.

I would give it a 5 star except that it is pricey however, it did a great job and my problem was solved.

Wow paying attention to the torque wrench is important haha woops! These saved the day and about 500 smakers!

This kit saved my butt! I thought I was going to have to replace the front cover until I found this kit. Thank you guys for putting this together and shipping so quickly.

The product worked great and everything I needed was included to save the front cover. My only complaint is that the provided drill bit is for a 1/2 drill chuck. I had to go buy a 1/2 jacobs chuck that fit my angle drill to perform this repair. Beyond that headache with the drill and my nerves being shot from trying to be as accurate as possible; IT WORKED!!!!! :)