Features1This is a bike seatpost, made of good quality aluminum alloy material, strong and durable. 2The sealing ring design is adopted to effectively protect the cleaning of the seat interior. The sealing ring can cooperate with the seat tube more closely to prevent rain water, cement sand and dust from entering. 3The seat stem is designed with a double-nailed rear punch, and both locking screws are made of 10.9 grade torque screws to make the lock more stable. 4The internal cable length is about 130 cm, if your bike's is too long, you can cut it. 5Suitable for road bike, mountain bike, etc.SpecificationItem Type: Bike Seatpost Material: Aluminum alloyColor: as picture shownControl: wire controlApplicable: mountain bikeAdjustable stroke: 0-100mmSpecification: 31.6Size: approx. 440mm/17.3inchAssembly instructions:1. Confirm that the size of the middle tube in the frame is applicable to this lifting tube (31.6mm).2. Confirm that there is no foreign body in the inner tube of the frame that may cause scratch, such as burr, metal chip or sand3. Install the lifting seat tube on the frame in the right direction, and the exit line of the control line is facing the rear of the frame, as shown in figure A);4. Install the control handle group on the handlebar (as shown in figure B)5. Use the harness belt to fix the control line to the frame appropriately6. Pry the handlebars left and right to make sure the control line does not interfere with steeringOperating instructions:The lifting seatpost has 3 sections of fixed height adjustableStep 1 lower seat height:Continue to press the control handle and press the seat down with your weight. Once the seat begins to move, release the control handle. When the seat continues to drop to the next position, it will automatically snapStep 2 raise seat height:Lift your hips slightly off the cushion. Keep pressing the control handle while slowly raising the buttocks to make the seat rebound. Keep pressing the control handle while slowly raising the buttocks to make the seat reboundNote: if the height segment is not properly secured or cannot be secured, please adjust the tension fine-tuning button on the wire set (as shown in figure C).Package List1 x Bike Seatpost