Have you ever fumbled around with a cassette lock ring tool an adjustable wrench a chain whip? I have and it can be a little awkward, to say the least. Have you ever stripped the threads of a cassette lock ring on a brand new cassette because your lock ring tool shifted a little as you placed your adjustable wrench on it. I have and it sucks. This BBCassette wrench from Feedback Sports is just the right tool for the job. I've removed and replaced cassettes with a lot more ease and less worry. As a bottom bracket wrench it is so much better than the little plastic thing that is supposed to help you with FSA or Shimano Hollow-Tech BBs. I like a combo tool like this and for $20 dollars it is a good deal.
This is a great combo tool for cassette lockrings, Shimano bottom brackets and external disc rotor lock rings. Finish quality is excellent and very useful in the garage and for bike travel assembly.