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Integrated Structure: Square Taper Bottom Bracket integrated System can frame, more power output, it's better than ordinary structure bottom bracket. Easy to Install: The Bike Bottom Bracket steel shell can absorb roundness tolerance for installing ports of Bracket Bottom. Notes: Please use the BB tool to install and replace the bottom bracket for safety. Long Service Time: The Bike Bearing Bottom Bracket is solid and durable with a long service time. Suitable for: Bottom Bracket Bearing suitable for 68mm frame shell.