FSA ACR (Aerodynamic Cable Routing) Stems have a low profile frontal area that is suitable for road and gravel riding. Aerodynamic Cable Routing (ACR). Low profile frontal area. Body and faceplate crafted from 6061 T6 alloy with chromoly hardware. Specific frame and headset required. 31.8mm handlebar clamp diameter. 30mm fork clamp stack height. Compatible with K-Force Light ACR Compact, SL-K ACR Compact, Energy ACR Compact, K-Wing AGX and K-Wing AGX handlebars. Item Specifications: Stem Angle (deg): +/-6, S.H.I.S. Stem Clamp Diameter: 28.6, Defined Color: Black, Stack Height: 30, Weight: 235, Color: Black, Material: Aluminum, Length: 100, Bar Clamp Diameter (mm): 31.8,