Feature 1The bottom bracket is solid and durable with a long service time. 2The steel shell can absorb roundness tolerance for installing ports of Bracket Bottom. 3Integrated system can protect the frame, more power output, it's better than ordinary structure bottom bracket. 4Suitable for 80/100mm frame shell. 5Please use the BB tool to install and replace the bottom bracket for safety.SpecificationFeatures:1. The bottom bracket is solid and durable with a long service time.2. The steel shell can absorb roundness tolerance for installing ports of Bracket Bottom.3. Integrated system can protect the frame, more power output, it's better than ordinary structure bottom bracket.4. Suitable for 80/100mm frame shell.5. Please use the BB tool to install and replace the bottom bracket for safety.Specifications:Condition: Item Type: Bicycle Bottom BracketMaterial: SteelColor: BlackFitness: for 80/100mm Frame ShellCups thread size and pitch: 34.798mm 1.37 * 24TPIOptional Style: 80*142mm, 100*155mm, 100*177mmSize: Approx. 80 * 142mm / 3.1 * 5.6inch, 100 * 155mm / 3.9 * 6.1inch, 100 * 177mm / 3.9 * 7.0inchWeight: Approx. 384gPackage List:1 * Bottom Bracket with Screws