1. and : Made of high-quality aluminum alloy, strong and , fine workmanship, and . 2. Impervious and Dirt-proof: Sealed bearing, compact structure, to avoid the penetration of damp and dirt, lubrication is comfortable, and . 3. Exquisite Thread: Threaded lock design, strengthen the stability of the side, not easy to loosen. 4. Convenient Installation and Operation: The hollow one-body hanging type can increase the pedaling frequency, reduce noise, and make riding more labor-saving. Easy installation and operation, providing better pedal power transmission. 5. Wide Application: 3 resin washers. Even rotation, easy installation and operation. Suitable for frame bottom bracket 68-73mm. Colour:Black Material:Aluminum alloy + plastic Package Contents: 1 * Threaded Bottom Bracket 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.