Nine different specifications allow you to choose the most suitable one according to your needs. The hollow design makes it possible to reduce weight.The vacuum-coated surface makes it extremely corrosion-resistant and not easy to fade. Exquisite and professional workmanship makes it very sturdy and safe.It is made of aluminum alloy material, which is very durable to use.There are nine different specifications for you to choose.It is suitable for downhill bikes, road bikes, mountain bikes, etc.Item Name: Bicycle StemMaterial: Aluminum AlloyFeatures: Easy to Install, Stable, Increase HeightSize Details:Distance Between Two Holes:4cm/1.57" (Approx.)5cm/1.97" (Approx.)6cm/2.36" (Approx.)7cm/2.76" (Approx.)8cm/3.15" (Approx.)9cm/3.54" (Approx.)11cm/4.33" (Approx.)12cm/4.72" (Approx.)13cm/5.12" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bicycle Stem