Alston Carbon Fiber Bicycle Handlebar Stem 31.8 80/90/100mm Ud Matt Material: 100% Carbon Fiber Matt Black finish,4 Bolt Handlebar Clamp Conforms to Both EN MTB and Racing Standards Diameter Size: 31.8mm,Stem Length: 80mm, 90mm, 100mm Weight80mm-130g,90mm-140g,100mm-150g.Angle: 6Steerer clamp size: 28.6mm