[High-quality materials]The bottom bracket is strong and durable. The steel shell can absorb the roundness tolerance of the bottom port of the mounting bracket. It is better than the ordinary structural bottom bracket. [Professional Performance]The integrated system can protect the frame, output more power, better than the ordinary structure bottom bracket,Waterproof and dustproof bearings and bearing design help prevent erosion from sedimentation water. [Easy to install]The bottom bracket is sturdy and easy to install,Square tapered bottom bracket. Matte finish.<br><br>Top Quality: Square tapered bottom bracket is durable and made of high-quality materials for long-term use Colour:As Shown Material:Metal Size:100x155mm<br><br>Package Contents: 1 x Mountain bike square hole bottom bracket<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.