Features: Steel star fangled nut for anchoring headset compressions in steerer. Make of Alloys steel materials,light weight and Enduring, not easily to deforms.Suitable for bike front fork diameter 28.6mm (1-1/8inch). Great for road bike,mountain bike. Easily installation and carry. It's essential component for bike enthusiasts look to upgrades or repair their bike. Its strong construction ensures it can bear heavy use, providing long terms performances. Specifications: Materials: Alloys steel Height: about 16mm/0.63inch Diameter: about 26mm/1.02inch Package Includes: 10pcs Bicycles Headset Star Nut note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.