Park Tool HR-12 12mm Hex Wrench The Park Tool HR-12 is a great big hex wrench. It is designed specifically for the removal and installation of free hub bodies. Constructed of high torque industrial steel, it is guaranteed to be living in your tool drawer for many, many years. Features Tip Size 12mm Constructed of high torque industrial steel Chamfered tips for a precision fit Manufacturer's Part No: HR-12 UPC: 763477004369 | Park Tool | Hr-12 12Mm Hex Wrench Hr-12, 12Mm, Tool