The TL152 E Bike lockring tool is designed for the installation and removal of the chainring lockring on Shimano Steps E Bike motor units. Key Features: - Strong and durable, heat-treated steel - Shimano Steps compatible (E6100, E7000, E8000, E9000) - Use this tool with a 16-notch 44mm Hollowtech II bottom bracket wrench - Refer to the manufacturer's torque settings if applicable