The Race Face Evolve XC Stem OS is designed specifically for cross country racers & trail riders looking for a lightweight performance stem at a reasonable price. Forged & blasted 6061 aluminium for high strength & fatigue resistance at a reasonable weight. Four bolt bar clamp holds bar securely in position. Interlocking U-Shaped Handlebar Clamp Geometry. Faceplate eliminates “stress risers” which could cause your bar to bend or break. This is particularly important for carbon bar users. Machined logo on bar clamp gives this value-oriented stem a high end look.