Specialized tool to fit 12-spline lockring. I found it helpful to hold it in place by re-inserting quick release skewer before wrenching to keep it from slipping out.
Never disappointed when I buy Park Tools. New disc wheels required me to buy this new tool. The old one is at least 25 years old works great but wonï¿½t work with disc hubs.
I used this to take off my cassette that was put my old wheels, and also put on my old cassette to my new wheels. This tool works seamlessly and is just a must get if you are using a Sram or Shimano cassette.