DescriptionIf you are looking for a professional and affordable bike seat post adapter, then your research is over here. That's because our product can meet your need. Adopted of premium material, it is practical and durable for long time use. It is not easy to get deformed and bring you much convenience.Features-Color:As Shown -Material:Aluminum alloy -Size:6.50X3.50X3.50cm/2.55X1.38X1.38in - CNC machining, anodized surface, not easy to fade. Convert 27.2mm to 30.9mm seatpost socket. - High grade aluminum alloy material, sturdy and durable to use. - Can be used as seat post tube, seat post reducer socket, seat post reducer adapter, fixed gear seat post tube. - It is simple in design, but very practical in use, which brings great convenience to you. - Simple in structure, easy to use, not easy to deform, you can use it with confidence.