About this item Headset Spacer Kit: Compatible with 1-1/8″ (28.6 mm) front stem fork of MTB, BMX, mountain bike, road bike etc. Light weight, strong pressure resistance, not easy to deform Premium Material: Headset Spacer and Top Cap made of Aluminum Alloy for lightness, Bicycle Fork Headset Star Nut and Bolt made of Steel for durability. Smooth surface, exquisite workmanship, sturdy to use Multi-Sized Headset Spacers: 4 different sizes for you to adjust the appropriate height, and the small size of spacers (2/3/5/10 mm) let you have a more precise height adjustment Bright Colors: Headset Spacer Kit with black anodized treatment, the surface does not fade, and it is machine cut with ultra-precision diamond blades. Beautiful colors, great bike accessories Package included: 6pcs Bike Headset Spacer (10 mm *3, 5 mm *1, 3 mm *1, 2 mm *1) 1pcs Headset star nuts 1pcs Stem Top Cap 1pcs Headset Bolt. This set can meet your cycling needs