This kit makes quick work of the reaming process. I have used the small, medium and large reamers many times without fail. If you stop and clean out the grit with a soft brush as you use it, it keeps on working well. If not, the grit loads up and almost does not work. I was disappointed the one time I made a rod large enough to need the XL reamer. It broke at the through pin location on the mandrel on my first use. I was able to use it by my hand (no handle) for a very long reaming process, but I was able to finish the rod.