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For all brands of 9-speed chain.
Quick-release tool-free fastening system
Tool-free attachment: - fit the two links together, - give the crank arm a sharp turn, - check that the links are correctly in place before use.
A quick-release tool is highly recommended to avoid damaging your chain. https://www.decathlon.fr/pince-attache-rapide-chaine-id_83523.html
The technicians at your Decathlon store workshop are available to help you replace the parts of your bike. Feel free to ask them for help!