27.2 mm

Feature:Bicycle Seat Post Adapter is made of aluminum alloy material, which is durable in use.Stylish appearance, portable, not rust easily, transforms your vehicle's plain interior and adds a unique of color.Easy to install and remove, no drilling or cutting required, just install directly to the bicycle.Specifications:Condition: Brand NewMaterial: Aluminium AlloyColor: Black Inner Diameter: 25.4mm / 1"Outer Diameter: 27.2mm / 1.07"Length: 60mm / 2.36"NotePlease allow a 1-3 mm error due to manual measurement.Package Included:2 x Bicycle Seat Post Adapter.