The SR-12.2 Chain Whip holds cassettes in place for easy lockring removal, making it an essential tool for bike maintenance. Works on all 7-to-13 speed road and mountain bike cassettes, as well as single-speed cassettes with a 3/32" cog. The SR-12.2 also incorporates a 1" box-end wrench to drive Park Tool Freewheel & Cassette Lockring Tools. The tool is heat-treated to prevent bending or flexing, and features hardened pins to keep the chain in place. Long ergonomic molded handle provides leverage and extra comfort.