Zipp Service Course SL Stem is crafted from 7075 aluminum, and features a shape that strong and lightweight. To meet the needs of different riders and fit, the stem is available in multiple options.Features-Wide range of sizes and 6 deg angle-Service Course SL OS stem made for 1-1/4” steerer tube bikes-Lifetime warrantyItem Specifications-Stem Angle (deg):6-S.H.I.S. Stem Clamp Diameter:31.8-Defined Color:Black-Stack Height:41-Weight:140-Color:Matte Black-Material:Aluminum-Length:80-Bar Clamp Diameter (mm):31.8