Proven time after time to be a reliable, easily adjustable system that continues to outperform the competition, the 4-Axis stem is a sure fire go to for an entry level stem that has world class performance.Item Specifications-Bar Clamp Diameter (mm):31.8mm-Color:Black-Defined Color:Black-Material:Alloy-Length:100mm-Stem Angle (deg):30deg-S.H.I.S. Stem Clamp Diameter:28.6