Feature:1. It is made of aluminum alloy with high hardness and corrosion resistance.2. The seat tube has a heightadjusting ruler, and the installation is more clear.3. Each seat tube has a lower installation limit to ensure that the part under the installation safety line is completely inserted into frame seat tube to ensure safe riding! Note: the weight limit is 80KG/2821.9oz.4. The inclination of the seat cushion can be adjusted steplessly, which is convenient and safe.5. Suitable for most of road bikes, mountain bikes, downhill bikes, track bikes and so on.Specification:Item Type: Bicycle SeatpostMaterial: Aluminum Alloy Color: As Pictures Shown Product Diameter: Approx. 33.9mm/1.3inTotal Length: Approx. 60cm/23.6inLoad Bearing Limit: 80KG/2821.9ozQuantity: 1 pcInstallation detailsYou can insert the plug first and then insert it from there.Then push the screw through the two holes and tighten the screws in the two lugslay the saddle in reverse and put the seat piece inThen install the tube upside down as shown in the picture, remembering that the lower side is in the front and the higher side is in the backlock one side screw first and adjust the middle clamp and screw of the seat tube to adjust the AngleFinally lock the screw.Package List:1 x Bicycle Seatpost2 x Screw 4 x AccessoryNote:1. Manual measurement, please allow 12mm error, thank you!2. The picture may not reflect the actual color of the project due to the differences between different displays.3. The seat double bow needs to be reserved for installation with a length of about 5.7 cm/2.2in. If it is shorter than this distance, it cannot be installed.4. Please install the sitting tube to cross the safety line.