Features: Suitable for bicycles with for BSA width of 68-73mm, with strong compatibility. The hollow one-body hanging type increases the pedaling frequency, reduces noise, and makes riding more labor-saving. The threaded pair lock enhances lateral stability, prevents loosening, and rejects abnormal noise. Three fine-adjusting washers are included to adjust the distance of the chain center line of the crank piece, which is convenient for customers to use. brand new and high quality The sealed bearing structure avoids the penetration of moisture and dust, is lubricated and comfortable, and is durable. Specifications: Material: Aluminum Alloy + Nylon Bearing: Bearing Color: Black and Red Inner Diameter: 24mm Weight: about 95g Package Includes: 1 x Ceramic Bottom Bracket. note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!