Features: Please confirm your handlebar is 31.8mm(1.25'') before you buy it. Degree: 0-120° adjustable.not applicable to giant-bicycles.the mountain bike stem is constructed of high-strength aluminum alloy.lightweight and durable mtb-stem. Use the adjustable stem to achieve a more comfortable riding position, the pain-caused by the-setup in shoulders/arm/back had to be corrected. this stem and a riser handlebar did-the trick, allow you to sit more upright-on bike which is better-for-your back. Easy to install,just connect up the front fork stem. four bolt-bar clamp holds bar securely in position. Adjustable handle bar stem suitable for most road bike,mountain bikes,downhill-bike, track bike,fixed gear bicycle,MTB-BMX Specifications: Material:Aluminum Alloy Front Fork:28.6mm/1/8" For Handlebar Diameter:31.8mm/1/4'' Length:100mm/3.94inches Package Includes: 1 Piece Mountain Bike Handlebar Riser Extender note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the picture may not reflect the actual color of the item.