Description:Made of High quality 6061 aluminium alloy, the bicycle adjustable seat post seat post, high strength, strong, sturdy, lightweight, durable and long lasting

Up and down adjustable height makes it fits all kinds of height of people

Calibration on surface helps to raise height of saddle to ensure rider a comfortable riding experience

Suitable for most mountain bikes, road bike, track bike, MTB, BMX, etc

How to choose the size: first you can check the diameter of the seatpost, choose the same size as the diameter, and second measure the inside diameter of the frame tube

Specification:Diameter:30

9mm/1

217 inch, 31

6mm/1

244 inchLength: 375mm/ 14

76 inch Color: BlackPackage Includes:1 Piece Bike Adjustable Seatpost1 Piece Shim Adapter (Only For 31

6mm)Note:Only the 31

6mm one comes with a shim adapter