Hex key 4mm 240 x 40 De Dietrich 97949451

The hex key 4mm 240 x 40 is a handy tool for servicing boiler and burner components that require a 4mm hexagon socket. With a length of 240mm and a short arm of 40mm, this key provides good leverage and access to recessed fasteners. It is commonly used for adjusting or replacing parts such as nozzles, electrodes, and other burner assembly elements. Made from hardened steel, this hex key resists wear and ensures a precise fit. Including this tool in your maintenance kit can simplify repairs and adjustments on many heating systems.