For cross country and all-mountain riding, Dimension Trail Stems provide a broad array of sizing options--lengths from 35 to 120mm--rigorously tested to ISO 4210 Mountain standards Constructed with AL-6061-T6 aluminum Shot-peened finish Bar Clamp Diameter: 31.8mm Material: Aluminum Stem Angle (deg): +6 deg, -6 deg S.H.I.S. Stem Clamp Diameter: 28.6 Stack Height: 37mm Color: Black Dimension stems are not intended for use with carbon handlebars or carbon steerer tubes