The Boxcar Stem is the perfect combination of stiffness, strength and light weight.Screws are high strength stainless steel with the popular T25 head. Made with 2024 aircraft alloy. Item Specifications: Stem Angle (deg): +15, Stem Angle (deg): -15, S.H.I.S. Stem Clamp Diameter: 28.6, Stack Height: 36, Weight: 155, Color: Black, Material: Aluminum, Length: 70, Bar Clamp Diameter (mm): 31.8,