An easily accessible hidden compact chain tool kit housed in handlebar ends for your mountain bike. Features CrMo steel chain tool for single and multi-speed chains up to 13 speed including SRAM Flattop chains and Campagnolo hollow pin chains. Included chain hook holds links during assembly.Chain tool requires 4mm bit or wrench to operateMaterial: hardened steel / engineering grade polymer Limitations: handlebar ends with minimum 105mm straight section ID range 17 - 21 mm Weight: 52 g / 1.83 oz