For bike front fork diameter 1-1/8" (28.6mm) Made of alloy steel , durable and light weight Fit for mountain bike,road bike Package included: 5pcs / bag Made in Taiwan, Good Quality Star Nut MTB Road Bike Headset for Fork 1-1/8"(28.6mm) Star Nut MTB Road Bike Headset for Fork 1-1/8"(28.6mm) For Fork 1-1/8"(28.6mm) For Fork 1-1/8"(28.6mm) 5pcs/Bag Star Nut MTB Road Bike Headset for Fork 1-1/8"(28.6mm)