I've read some reviews here that said these didn't work well, even after chucked up in a drill. All I have to say is, those folks must have had some pretty nasty buildup.

In my case, with 260,000+ miles on my 7.3L Powerstroke, the junk was minimal and these brushes did a great job of cleaning up the injector cups. At first I couldn't figure out what the second bush (not shaped like the cup) was for, but soon figured it out as I inspected each cup after brushing and discovered the bottom edge was still a bit gunky. -That- is what the second brush is for. It helps scrub the bottom interior of the cup, getting the inner edges nicely. I'm glad I got these before installing the new injectors. I had nice clean cups.

Good brushes, work well. Little expensive but then again I couldn't find something the correct shape anywhere else.

I didn’t want to do my cups twice. Brushes are pricy but give peace of mind that they are doing the exact task they were designed for, and will clean thoroughly without damaging the injector bore

Great brushes, since preparation is King! for proper sealing, they were a must, since that old compound was not easy to remove even with them,

Worked for the job and should work for many more. Quality brush kit, although could've been a little lesser of a hit on the wallet

These two brushes work well to clean out the bores in preparation for installing new injector cups. Used in conjunction with aerosolized brake cleaner, these brushes make bore cleaning easy.

Thank You

This is a great set! It gets into all of the injector sleeves easy! I wasn't able to get everything off with them, I still had to use a scribe for some of the retaining compound left by the injector cups but these brushes made the job much easier and it also made it easy to ensure the sleeve was clean prior to installing the injector cups by simply wrapping an clean white t-shirt around it and sliding it in to check for oil. All in all, a great set that made the job much easier!

This product works really well for getting the old retaining compound out...for those claiming they had to cut the handles and attach to a drill, this is unnecessary and destroys the brushes which iv already used for a couple other things great quality brushes. It takes time an hour or so per cylinder helps to use a pic, I made one out of a coat hanger I sharpened on a grinder, with the use of a snake cam I was able to make sure all the black build up was gone from each bore.