RaceFace Chester Stem Forged and blasted 2014 alloy for high strength and fatigue resistance at a reasonable weight 31.8mm Clamp, 8-Degreex50mm, 1-1/8-Inch Four bolt bar clamp holds bar securely in position Interlocking U Shaped Handlebar Clamp Geometry transferring more load through the stem body and not the bolts Faceplate eliminates stress risers which can cause your bar to bend or break