RaceFace Turbine Stems Intended for XC, Trail and All Mountain use Machined to precision with 7075 aluminum for high strength & fatigue resistance at a very light weight Interlocking 4 bolt bar clamp secures your bar and distributes loads away from bolts and into the body SPECS : Material: Aluminum Color: Black S.H.I.S. Stem Clamp Diameter: 28.6 Length: 60 Bar Clamp Diameter (mm): 31.8 Stack Height: 39.5 Weight: 135 Stem Angle (deg): +6 , -6