Design: Sealed cartridge bearings, fits 68mm bottom bracket shell Square tapered bottom bracket. Matte black finish. Feature: It is a built-in sleeve and inner bearing to ensure the bearing rotates stably. Waterproof, dustproof and bearing shield design, which can help prevent sediment water erosion. Cup thread diameter: 34.5mm / 1.36inch. Size: 68x118mm/2.7x4.65inch. Integrated structure: No abnormal noise, without gaps to prevent the assembly from being stuck, safe for use. Note: Please use the BB tool to install and replace the bottom bracket for safety. Item Specifications: Type:Bottom Bracket Shell Width:68mm Spindle Interface Type:Square Cone For Bike Type:Mountain Bike Material:Metal Color:Black and Silver Size:As shown Quantity Sold:1 pc About chromatic aberration: The goods sold are all taken in kind, but due to different lighting, monitors, etc., there will be a little color difference, which is a normal phenomenon, not a quality problem! About size: The dimensions of the products sold are all manually measured. Due to different measurement methods and tools, there may be an error of 1-2mm, which is normal!becomeveryrich