AWE CNC 6061 Alloy Seat Clamp with CNC 7075 Alloy Quick Release Lever 31.8mm Black Made From CNC 6061 T6 Alloy Extra Lightweight Base & 7075 Alloy Lever 7075 Alloy Quick Release Lever For Easily Adjusting the Saddle Height. This Alloy Is Exceptionally Strong With Strength Similar To Steel But Lightweight Fits Onto 31.8mm Seat Post, Tensile Strength 310MPa Low Weight: 40g, Hardeness Vickers 100HV, Shear Strength 190MPa 6061 - T6 Alloy Is A Medium to High Strength Heat Treated & Artificially Aged Alloy. It Has Very Good Corrosion Resistance And Very Good Weldability. Extensively Used In The Aerospace & Military Industries