Cast aluminum stem. 17° angle that is almost horizontally when mounted to clamp. Of course, it can also be flipped over and elevated to the handle position than the normal angle stem. Stainless bolt Handle Clamp Diameter: 1.2 inches (31.8 mm); Bar Clamp Width: 1.5 inches (38 mm); Stack Height: 1.6 inches (40 mm); Angle: 73° (Rise ± 17°); Column Size: 1-1/8 product design, specifications, and appearance may be changed without prior notice.