Ritchey Pro 30 Degree Road/Mountain Bicycle Stem - 31.8 x 100mm 3D net forged 6061 aluminum Angled steer tube clamp slot reduces stress on carbon steer tubes Handlebar Clamp Diameter: 31.8 / Finish: BB Black Steerer Height: 45mm / Steerer: 1-1/8" Faceplate Width: 40mm / Approx Weight: 155g (110mm)