Zipp Speed Weaponry Service Course SL-OS Stem - 130mm, 31.8 Clamp, 6 deg, 1-1/4", Aluminum, Polished BlackZipps Service Course SL Stem is crafted from 7075 aluminum, and features a shape thats strong and lightweight. To meet the needs of different riders and fit, the stem is available in multiple options. Wide range of sizes and 6 deg angle Service Course SL OS stem made for 1 1 4 steerer tube bikes Lifetime warranty Product Specifics Stem Angle (deg): 6 S. H. I. S. Stem Clamp Diameter: 31. 8 Defined Color: Black Stack Height: 41 Weight: 140 Color: