The body of the stem is constructed from heat treated 6061 alloy that is 3D Net forged for incredible strength 4-Axis stiffness at moderate weight. The solid one piece faceplate is reassuring and highly effective, and many will like the fact that it has a full black finish. The rear of the stem has opposing bolts and an angled clamp to properly disperse pressure on the fork's steerer tube. Clamping diameter is the industry standard 31.8mm. Fits 1⅛" forks only.