Item Name: Star Nut Adjuster Headset Stem Top Carbon Compression Plug Bicycle Fork Steerer. Color: SilverMaterial: Aluminum alloy + 304 Stainless steel Package weight: 57g / 2.0ozPackage size: 8 * 7 * 4cm / 3.1 * 2.8 * 1.6inQuantity:1pcBrand new with high qualityThis RISK compression plug assembly are specially designed for carbon fiber forks and mountain bike suspension forks with 25.4-28.6mm outer diameter. Safely and securely compress your headset together when using a carbon fiber fork with a carbon steerer tube. It an excellent piece of kits that does what it promises. Features:Compression plug , made of aluminum alloy and stainless steel.Designed for carbon fiber forks and mountain bike suspension forks with 25.4-28.6mm outer diameter.Adjust the diameter from 22.2mm to 25.4mm fit into steerer tube by screwing the compression bolt.Securely and safely compress your headset together when using a carbon fiber forks.Disassemble the assembly and grease each part except the sleeve before installation.Easy installation with 6mm and 8mm Allen wrenches.Use for 1-1/8" (28.6mm) StemPackage Include: 1 * Headset Compression Plug Note:1.1cm=10mm=0.39inch2.Please allow 0-2cm error due to manual measurement.