Specification: Name:Adjustable Stem;  Size(approx.):  Type A - 31.8*90mm/1.25*3.54in;  Type B - 31.8*110mm/1.25*4.33in;  Type B - 31.8*145mm/1.25*5.71in;  Color:Black;  Material:Aluminum alloy;    Features: 1. Adjustable Heightened Stem: 3D forging process, aluminum alloy material, adjustable plus or minus 85 degrees, durable, frosted, smooth and not hurting hands.  2. Sturdy and DurableL Aluminum alloy material, sturdy and durable, aluminum alloy material, 3D forging process, high strength, durable.  The surface is frosted and smooth, not hurt your hands.  3. Clear and Beautiful: Laser technology, laser marking, the logo is clear and beautiful.  4. 3 Specifications: 3 specifications, multiple options, easy to adjust to appropriate height.  5. Stem Cover: The cover back is marked with angle scale and the direction of rotation. Laser engraving technology, very clear.    Packing Included: 1 x Bike Handlebar Stem;    Note: 1. The diameter of the front fork of handlebar lock is 28.6MM, the diameter of the handlebar is 31.8MM. Please choose with your handlebar diameter of 31.8MM. For example: 31.8 adjustable stem 110mm long, specific dimensions: 28.6mm for front fork hole, 31.8mm for handlebar hole, and 110mm in length.    2. The angle can be adjusted, ±85 degrees, the height of the handlebar can be changed by changing the angle, and you can adjust the height at will.