Ritchey Pro Stems are constructed of 3D-Net forged 6060-T6 aluminum and a 4-bolt faceplate that wraps 180 degrees around the bar to reduce stress.40mm stack heightAngled steerer clamp helps prevent damage to lightweight aluminum and carbon steerer tubesStainless steel bolts3D-Net Forged 6060-T6 alloy40mm height, 140-183 gramsItem SpecificationsColorBlackWeight160gIntended UseRoadBar Clamp Diameter31.8mmStem Angle120degStem Length80mmSteerer Tube1-1/8" ThreadlessDefined ColorBlackS.H.I.S. Clamp Diameter28.6