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ProTaper ATAC Stem - 70mm 31.8mm clamp Limited Edition Polished MFPN=8-BIT-BLK-ORG }Zipp CeramicSpeed Freehub Body andProTaper ATAC Stem 70mm 31. 8mm clamp Limited Edition Polished. The ATAC is back. One of the oldest names in the high end stem game has returned. And this time its all blinged out with titanium hardware and a fresh laser etched finish. Aluminum construction with Titanium Hardware Rise: + 5 degrees Clamp Diameter: 31. 8mm TECH SPECS Bar Clamp Diameter (mm) 31. 8 Color Limited Edition Polished Defined Color Silver Length 70 Material Aluminum S. H. I. S.