The Park Tool SR-2.3 Sprocket Remover/Chain Whip is a professional, shop-grade tool designed to provide security and leverage for cassette removal. It is compatible with cassettes from 7 to 12 speed along with 3/32" single speed. Features: A shop quality chain whip that provides incredible leverage without worry of slippage Head is uniquely designed and shaped to allow quick and accurate access to any cassette or freewheel Compatible with 5 to 12-speed mountain and road bike cassettes and freewheels Works for 3/32" single speed (for 1/8" single speed, see SR-18.2) Heavy duty, heat-treated head and round vinyl-coated handle 38cm (15") tool length