Presentation packaging, for Shimano cassettes, suitable for 1/2" ratchet and 21 mm wrench. This is how professional drive systems work.Looking for tools for SHIMANO cassettes? The CONTEC sprocket remover is perfect for mounting and dismounting SHIMANO sprockets. The tool is simply inserted with the grooved side into the cassette's fixing bolt on the disassembled rear wheel and can then be opened with a 1/2" ratchet or a 21 mm open-end wrench. Meanwhile, the cassette is held in place with a chain whip.The professional tool for all bicycles with standard SHIMANO cassettes. Main color black Size inch 1/2 " Application cassette / sprocket Type/sort Item Version cassette / sprocket