This combination chain whip and freewheel / lockring remover wrench is heat treated to prevent bending and flexing. Park Tool Chain Whip SR-12 molded handle for comfort Works on 5- to 12-speed cassettes and freewheels 1" (25.4mm) box-end wrench fits Park Tool Freewheel/Cassette Lockring Tools Features hardened pins to keep the chain in place
