Features:1. Material product of stell, surface with electrosilvering, waterproof.2. Suitable for sq. crankset & BB, specification M8*15.3. Bicycle universal, with nice quality.4. With plastic seal, no separate crank cap needed.Specifications:Color: As showedMaterial: SteelLength: 2.4cmDiameter: 2.1cmType: M8*15NOTE: Please enable some mistakes of manual measurement, thanks to your understanding!Package Includes:1 PCS X Aluminum Bike Crankset Bolts Screws Nuts