Fouriers Bike Headset Expander Plug Nut Fits on ID Ø22.0 ~ Ø25.0 carbon forkMaterial: Alloy 6061-T6 with Alloy top capLength: 50mmWeight: 62gFor Ø28.6 carbon fork inner tube expander. Protect carbon fork tube from over tightening. Comes with alloy lightweight top