Features1Easy to Install: The headset spacer is light in weight and easy to assemble. The surface is smooth and the workmanship is exquisite. 2Flexible to Use: It is necessary for assembling a bicycle. there is equipped with multiple models and they can be fine tuned in multiple sizes, very flexible to use. 3Specification: The 6 pieces of aluminum spacers have thicknesses of 2mm / 0.1in, 3mm / 0.1in, 5mm / 0.2in, 3 x 8mm / 0.3in and an inner diameter of 28.6mm / 1.1in. They are suitable for bicycle toothless front fork stem with 28.6mm / 1.1in diameter. 4Aluminum Alloy: Made of high quality aluminum alloy material, the stem top cap and expander plug are environmentally friendly, sturdy and durable. 5Application: The bicycle headset spacer set has a wide range of applications, suitable for mountain bikes, road bicycles, fixed gear bicycles, etc.SpecificationItem Type: Bicycle Headset Spacer Set Washer Material: Carbon FiberStem Top Cap Material: AluminumExpander Plug Material: AluminumScrew Material: Stainless SteelWasher Outer Diameter: Approx. 34mm / 1.3inWasher Inner Diameter: Approx. 28.6mm / 1.1inWasher Thicknesses8mm / 0.3in5mm / 0.2in3mm / 0.1in2mm / 0.1inProduct Weight: Approx. 49g / 1.7ozApplication: Suitable for bicycle toothless front fork stem with 28.6mm / 1.1in diameterPackage List6 x Washer1 x Screw1 xStemTopCap1 xHeadset ExpanderPlug