Zipp Speed Weaponry Carbon Road Stem 31.8 100MM Incl Top Cap Clamp Diameter: 31.8mmClamp Diameter: 31.8mmLength: 100-129 mmSteer Tube Clamp Diameter: 1-1/8"Steerer Tube: 1-1/8" ThreadlessStem Color: CarbonStem Length: 100mmStem Rise: 10 degWeight: 155g