Which cassette removal tool

1964johnr
1964johnr Posts: 179
edited March 2015 in Road buying advice
I'm trying to build up my component changing knowledge and have just bought a replacement cassette and chain for my 9 speed Shimano Tiagra gears. I have the chain whip and now need to purchase the correct cassette lockring removal tool. Just took a look and there seem to be a number of different ones. I know it needs to have 12 splines to fit the cassette, but want to make sure I get the correct one. Can anyone point me in the right direction?

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