One of those tools you have to have, to do the job. Read more.
The FRW-1 is a one-inch fixed socket wrench that securely holds Park Tool freewheel and cassette lockring tools (FR-1 through FR-8 plus the BBT-5/FR-11) during removal and installation. Features an investment cast head with locking setscrew and a long, round, vinyl dipped handle for superior leverage.