1、Easy to Install: The headset spacer is light in weight and easy to assemble. The surface is smooth and the workmanship is exquisite. 2、Flexible 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. 3、Specification: 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. 4、Aluminum Alloy: Made of high quality aluminum alloy material, the stem top cap and expander plug are environmentally friendly, sturdy and durable. 5、Application: The bicycle headset spacer set has a wide range of applications, suitable for mountain bikes, road bicycles, fixed gear bicycles, etc. Item Type: Bicycle Headset Spacer Set Washer Material: Carbon Fiber Stem Top Cap Material: Aluminum Screw Material: Stainless Steel Washer Outer Diameter: Approx. 34mm / 1.3in Washer Inner Diameter: Approx. 28.6mm / 1.1in Washer Thicknesses： 8mm / 0.3in 5mm / 0.2in 3mm / 0.1in 2mm / 0.1in Product Weight: Approx. 49g / 1.7oz Application: Suitable for bicycle toothless front fork stem with 28.6mm / 1.1in diameter 6 x Washer 1 x Screw 1 x Stem Top Cap 1 x Headset Expander Plug