The Atlas 35 stem was designed to offer great stiffness and performance while still being lightweight. This stem is stiffer than the 31.8mm offering but remarkably lighter overall. It's an impressive stem for your DH/FR build.
35mm bar clamp
Four bolt bar clamp holds bar securely in position
Faceplate eliminates stress risers which cause your bar to bend or break
Opposing bolts on steer tube clamp provides extreme clamping power while reducing stress on the steer tube