This product has 2 Specifications, which is convenient for you to adjust the handlebar to the height suitable for you, and it is more comfortable to ride. Features: Aluminum alloy material is solid and practical. The polished surface is comfortable and smooth without hurting hands. To release the waist pressure. There is a height suitable for you. High stability, not easy to fall off, firmer, safer riding. Convenient and easy to install. Two-way crossforce, fine stability. Specifications: Size: 31.8*80mm, 31.8*60mm (optional) Color: silver Material: aluminum alloy Front fork install size: 28.6mm Installation size of handlebars: 31.8mm Handlebar Stem center length: 31.8*80mm: 80mm / 3.1in 31.8*60mm: 60mm / 2.4in Total length: 31.8*80mm: 122mm / 4.8in 31.8*60mm: 105mm / 4.1in Package size: 31.8*80mm: 125 * 50 * 50mm / 4.9 * 2.0 * 2.0in 31.8*60mm: 106 * 50 * 50mm / 4.2 * 2.0 * 2.0in Package weight: 125g / 4.4ounce Packing List: 1 * Bike Handlebar Stem