This combination chain whip and freewheel / lockring remover wrench is heat treated to prevent bending and flexing, with a molded handle for comfort Works on 1/8` fixed gear sprockets and single speed cassettes 1` (25.4mm) box-end wrench fits Park Tool Freewheel/Cassette Lockring Tools Features hardened pins to keep the chain in place Chain Whip SR-18.2UPC/EAN/GTIN: 763477006981