Machined from 6061 aluminum, this stem is virtually unbreakable. 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. Flippable design allows for mounting 2 lengths in 1 stem. DIRECT MOUNT: BOXXER. OFFSET HEIGHT FROM CROWN: 24mm (30mm position) 8.5mm (50mm position). BAR DIAMETER: 31.8mm