ITEM NAME:Durable Shim Adapter 25.4mm to 27.2mm Bike Tube Seatpost Convert Seatpost Description: - Made of aluminium alloy material,lightweight and durable. - Inner diameter is 25.4mm/1.0inch;outer diameter is 27.2mm/1.07inch, - Use this seatpost sleeve adapter ring, you can use 25.4mm seatpost on your 27.2mm bike seatpost. - Full CNC precision machining,anti-slip. - Suitable for MTB bike, mountain bike, road bike etc. Specification: - Material: aluminium alloy - Color: Black - Size:65 x 30 x 30mm/2.6 x 1.2 x 1.2inch - Inner diameter is 25.4mm/1.0inch - outer diameter is 27.2mm/1.07inch Package Included: 1 Piece Seat Post Tube.Made of aluminium alloy material,lightweight and durable. - Color: Black. - Full CNC precision machining,anti-slip.