Park Tool FR-5C Lockring Remover
Fits Shimano, SRAM, SunRace, SunTour, Chris King and other cassette lockrings.
Also fits Shimano disc brake lockrings.
Packaged carded: FR-5C
Always use a quick release skewer to hold the tool in place and snug to cogs when loosening. For solid axles, use the axle nut.
Shimano makes a similar tool with a guide pin that makes work infinitely more stable: http://www.pricepoint.com/Brand/Park-Tool/Park-Tool-FR-5G-Cassette-Remover-with-Guide-Pin.axd However, there are times (very rarely) where the guide pin gets in the way. When that happens, this is a good tool to have handy.
Easy to use, does exactly what it says it does. The only thing I would ask is that they make it compatible with socket wrenches. But I do not know if that is possible.
Another tool that just doesn't take up a lot of space in the box. My cassette comes off once a month for cleaning and this tool has been working for 15 years or so. No frills and small.
One tool every biker needs in their inventory. Affordable and does the trick!
Did great on removing my old cassette and installing my new one. Seems to be very well made.
Tool works well, 3/8" drive or you can use a large wrench. Has held up under impact use on a stripped lockring. Good tool and reasonably priced considering.