Unlike chains using traditional quick links, NJS chains feature a tiny bolt and 6mm square nut to affix the chain's ends together and everyone using a NJS chain has experienced that the square nut was loose or lost at least once.

This tool is the world's first portable "all-in-one" tool made specifically for the connection parts of NJS-certified chains, and is designed for practical use in the track field.

Made from chrome plated chromoly steel for lifetime use, the Runwell Bouncer features a beautifully machined knurled handle for delicate work, and the groove in the 6mm wrench end is equipped with a small but powerful neodymium magnet that holds small square nut after removal.

ⓘ Compatible with Izumi V Super Toughness, Izumi Super Toughness KAI, HKK Vertex and D.I.D. Racing Pro chains.