The ATAC is back. One of the oldest names in the high-end stem game has returned. And this time it's all blinged out with titanium hardware and a fresh laser-etched finish.Aluminum construction with Titanium HardwareRise: +/-5 degreesClamp Diameter: 31.8mmItem SpecificationsBar Clamp Diameter (mm)31.8ColorBlack/WhiteDefined ColorBlackLength50MaterialAluminumS.H.I.S. Stem Clamp Diameter28.6Stem Angle (deg)+5Stem Angle (deg)-5 ProTaper ATAC Stem Stems UPC: 844171076682