Sophisticated quality brings you a better experience, allowing you to better replace the damaged seatpost head. Excellent quality, using high-quality aluminum alloy, sturdy and durable. Clamp your bicycle seat firmly without shaking or loosening, bringing you a better riding experience. Product use, mainly used to repair the slippery wire of riders' seat tube chuck and to embellish the appearance of the whole car, so that your car looks more perfect and high-end. Please note that this seat tube chuck is not omnipotent. This is only suitable for some single nail head seat tubes and bicycles with single pole seat tubes. Specification Product name: Bicycle seat rod chuck Material: aluminum alloy Size: 5.5x5.5x3cm/2.16x2.16x1.18inch The main purpose of the product is to repair the slippery wire of the rider's seat tube chuck and to embellish the appearance of the whole car, so that your car looks more perfect and high-end. Precautions: This seat tube chuck is not a panacea, this is only suitable for some single nail head seat tubes, single rod seat tube bicycles. Package Include:1pcs*Bicycle Seatpost Head Saddle Pipe Head