Park's Master Chain Tool is designed specifically to work with the tight tolerances and narrow profiles of 10- and 11-speed chains and all high-quality derailleur chains. It's made of tool steel for excellent durability and uses an integrated link pocket to ensure precise alignment. It also features perfectly contoured, cushioned handles for comfort and ease of use. This pro-level chain tool includes a removable anvil to peen Campagnolo 11-speed chains. (The CT-4.3 is not compatible with Wipperman chains.)