One stem fits 2 handlebar diameters Special shim provides fitment for 31.8mm bars, and when removed, allows use of 35mm bars Intelligent no-gap clamp design in the bottom ensures no pinch points, and provides equal clamping force for safety and stability Aluminum 6061 T6 152g TECH SPECS Model Black One D-2 Steerer Dia. 1-1/8" Bar Dia. 35.0mm Rise +/-8 Deg Length 35mm Color Black/Black