The Lezyne Chain Gauge is a simple and reliable way to measure chain wear so you can replace your chain before wearing down your entire drivetrain. Precision machined for maximum accuracy, the Chain Gauge is compatible with most 5-12 speed bike chains. It also features a valve core removal tool and a bottle opener. Features: Compatible with 5-12 speed bike chains Includes an integrated Presta valve core remover and bottle opener Precision machined stainless steel for maximum accuracy and durability