The Titan Cassette / Freewheel Lockring Tool is designed to install and remove freehub cassette and freewheel sprocket cluster lock rings. This model uses Shimano's 12 spline industry standard. It has an easy to use built in handle and a center pin to hold it in place when you remove/install your cassette.
I love these tools. This tool is effective and well-priced, and preferable to the non-handled (traditional) versions. I recommend these to all my friends.