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 SramA(R) Flattop chains and CampagnoloA(R) hollow pin chains. Included chain hook holds links during assembly.Specification:- TOOLS - CrMo steel chain tool* and chain hook MATERIAL - Hardened steel / Engineering grade polymer MOUNT - Handlebar ends LIMITATIONS - Handlebar ends with minimum 105mm straight section ID range ;17 - ;21 mm REQUIREMENT - 4mm Allen bit or wrench SIZE - 10.8 x 2.5 x 2.5 cm / 4.25" x 1" x 1"