Features1Low Noise: Mountain bike bottom bracket is slippy to step on, reduce noise, and the weight is light while maintaining strength. 2High Strength: Aluminum alloy has high strength, strengthen lateral stability, not easy to loosen, reject abnormal noise, performance. 3Precise Machining: This bike bottom bracket is precisely machined, exquisite craftsmanship, service life growth, and is a replacement part. 4Good Sealing Performance: The integral sealing keeps the lubricant in the bearing, with good dustproof and waterproof effect, and is suitable for harsh riding environment. 5Easy to Install: This bike accessory is light in weight, small in size, and easy to install and use, an accessory for cyclists.SpecificationItem Type: Bike Bottom BracketMaterial: Aluminum AlloyGross Weight: 97g/3.4ozShaft Center: Approx.28.99mm/1.1in5 Way Part Inside Diameter: Approx.41mm/1.6inPackage List1 x Bottom Bracket2 x Washer