Neco Bike Headset Compression Top Cap, 1 inch and 1 1/8’’ Expander Nut PlugThe Neco headset compressor nut is best expander for your carbon bike and aluminum bike. While other headset star nut is only for metal fork tube, not works with carbon fiber tube. Neco is world class bike components supplier with over 30 years history. FEATURESSTRONG COMPRESSOR - Compression plug is good for carbon tube and aluminum tube, it offers stronger force and can protect the carbon tube as well. (Ordinary star nut is only for metal tube)LARGE SIZE - Bigger compressor is more stronger and safety. We offer expander depth 2 inch and 3 inch. 2 inch is large size, 3 inch in extra large. We recommend 2 inch for most scenario. Strong enough but budget cost1” & 1 - 1/8” - Small size is for 1” tube, fork inner diameter 20-22.2mm. Middle & large & extra large is for 1-1/8”, fork inner diameter 22-25.4mmCabon cap version looks very great. We recommend large size and cabon cap. Aluminum cap offered as wellNeco 100% original, high quality components and surface treatment, excellent strength for all heavy duty cyclingWeight: small size 40g, middle 45g, large 75g, extra large 85gAbout Neco NECO - Professional Bike Parts Manufacturers Neco Technology Industry Co. Ltd., founded in 1986, have been in the forefront of machinery tooling design and development. Having acquired more than 30 years of experience in the cycling field.Neco will always strive to meet the commitments to all of the customers and provide competitive, high-value products.