Shimano Dura-Ace ST-7900 Tool A For E-Ring Description: This Shimano Dura-Ace ST-7900 Tool A For E-Ring works to adjust, install, or remove E-Rings found within Shimano Dura-Ace ST-7900 integrated shift/brake levers, along with many others. Features: Tool A for E-Ring compatible with Shimano Dura-Ace ST-7900 integrated shift/brake levers See compatibility tab for full list of compatible shift/brake levers Specifications: Color: Black