Aluminum bike stem forged using the unique 3D Net Shape Forging method, ensuring maximum strength and the lowest possible weight. The design of the stem tightening reduces the load on carbon forks. Stainless steel screws. First-class performance and unparalleled reliability that is unmatched in a similar price range. Specifications Material: Aluminum 6061 Bolts: Stainless steel Lengths: 40-120mm Angle: 84°/6° Handlebar clamp diameter: 31.8mm Handlebar clamp width: 44mm For steerer tube diameter: 1-1/8" (28.6mm) For post height: 42mm Weight: 128g (100mm)