Like most "Universal" tools, this is just something to get you by... don't expect this to work well with all your firearms.
In particular, this will NOT work with Savage bolt-action rimfire rifles. Only one I know of does, and I believe Brownell's carries it.
You're much better off buying bore guides (yes, plural, guideS) made for your specific firearms, like Possum Hollow brand guides. I know that gets expensive, but it's really the only way to go.
Pros: inexpensive, fairly versatile
Cons: Far from the best guide out there
This review was written in the old system and had content requirements that are different than reviews written today.