The Grip Whip cassette removal tool can be operated with one hand and will quickly and easily remove any Shimano or Campagnolo cassette, as well as any 5-13 speed SRAM cassette, including Transmission models.
Featuring a textured, ergonomic rubber handle, it is operated by first depressing the thumb lever to open the jaws, then letting the spring lock closure grip onto a 10-24t cog. With six secure points of contact, it will hold the cog fast as it's loosened.
Should extra leverage be needed, it can be generated by slotting an 8mm L-handle hex wrench into the 8mm receiver in the tool's handle.