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FSA Afterburner Stem 31.8mm x 100mm ±12° Weight-1074g } Installation and removal tools3D forged and CNC machined 6061 T6 alloy construction for a balance of strength and weight. 4 bolt cold forged clamp face. 40mm stack height. 144g (100mm version) TECH SPECS Type Threadless Headtube Quill Diameter 1 1 8` Length 100 Bar Clamp Diameter 31. 8 Angle + 12 Color Black Material AL6061 T6 Finish Anodized Quill Length Fork Compatibility