Features： 1、The bottom bracket is solid and sturdy with a long service life. 2、Waterproof, dust bearing and load-bearing shield design, which can help prevent the erosion of sediment water. 3、Bottom bracket is very light and does not put extra load on the bicycle, more power, it is better than ordinary structure bottom bracket. 4、No abnormal noise, without gaps to prevent the assembly, safe for use. 5、Suitable for mountain bikes, variable speed bikes, etc. It is an important bicycle accessory. Specification： Features: The bottom bracket is solid and sturdy with a long service life. Waterproof, dust bearing and load-bearing shield design, which can help prevent the erosion of sediment water. Bottom bracket is very light and does not put extra load on the bicycle, more power, it is better than ordinary structure bottom bracket. No abnormal noise, without gaps to prevent the assembly, safe for use. Suitable for mountain bikes, variable speed bikes, etc. It is an important bicycle accessory. Specifications: Material: Steel Size: 68 * 113 /116 /118 /120 /122.5 /124.5 / 127.5mm (optional) Weight: 282g/ 9.9oz Package List: 1 * Bottom Bracket 2 * Screws Package List： 1 * Bottom Bracket 2 * Screws