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. NOTE: PLUG 'n CHAIN TOOL was designed to be used on handlebars with round ends only and should not be used on bars with other shaped ends. RING-PULL KNOB Makes storage and removal simple CHAIN REPAIR Used with any 4mm Allen wrench for chain installation or removal4mm Allen wrench not included HANDLEBAR LIMITATION Minimum 105mmInner diameter range ø17mm - ø21mm 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 ø17 - ø21 mm REQUIREMENT 4mm Allen bit or wrench SIZE 10.8 x 2.5 x 2.5 cm / 4.25" x 1" x 1" WEIGHT 52 g / 1.83 oz