Ritchey Pro Road Stem 2007 3D-Net Forged 6060-T6 alloy, 4-bolt Z-Clamp faceplate wraps 180 degrees around the bar to reduce stress. Angled steerer clamp helps prevent damage to lightweight aluminum & carbon steerer tubes. Stainless steel bar & steerer clamp bolts. 1" sizing sleeve included with road stems. 150g (110/31.8). Z-Clamp available only for 31.8 6 Deg Rise Buy Ritchey Pro Road Stem 2007 from Chain Reaction Cycles, the worlds largest online bicycle store.