1Aluminum alloy material, 3D forging process, high strength, sturdiness and durability, matte and smoothly surface does not hurt your hands. 2The inner hex double screw lock design, high stability and not easy to fall off, is firmer and safer to ride. 3The design of the stem cover, the back of the stem cover is marked with an angle scale and the direction of rotation is clear. 4Angle 85 degrees adjustable, by changing the angle to change the height of the handlebar. 5Freely adjust the height that suits you, release the waist pressure, there is always a height suitable for you. Item Type: Mountain Bike Stem Material: Aluminum Alloy Color: Black Suitable Handle Bar Diameter: Approx. 31.8mm/1.3in Hone Center Distance: Approx. 145mm/5.7in Front Fork Diameter: Approx. 28.6mm/1.1in Weight: Approx. 345.0g/12.2oz How to use: 1. Use a tool to loosen the upper cover and the locking screw underneath 2. Lift the handlebar up and remove the handlebar 3. Insert the stem into the front fork and adjust the angle 4. Tighten the upper cover and the locking screws, and the installation is complete 1 xMountain Bike StemThe diameter of the front fork of the handlebar lock is 28.6mm, and the diameter of the handlebar lock is 31.8mm. When choosing, please choose with your handlebar diameter of 31.8mm.