The hope downhill stem is cnc machined from a solid billet of 2014 t6 aircraft spec aluminium alloy with the increased demands being placed on these high stress areas hope have increased the amount of material in and around the steerer clamp bar clamp and mid sections to create an incredibly stiff stem for precise solid steering the opposing steerer clamp bolts of this mountain bike stem have been increased to 3 again to aid strength and stiffness and the 4 bolt clamp 318mm oversize only