Tool specially crafted tool for use with NJS chains that use a tiny bolt and 6mm square nut to affix the chain`s ends togetherMade from chrome plated chromoly steel, this incredible little tool features a flat screwdriver head and special magnetic nut holder for quick chain connections and disconnectionsFixer pairs perfectly with Izumi-V, Izumi Chainâs flagship productNJS Chain ToolBlackNJS ChainsUPC/EAN/GTIN: 4589931956083