... 31.8 1.Gr.9 titanium with Gr.5 machined bosses 2.Diameter:31.8mm 3.70/80/90/100/110/120mm 4 ... , stems, seat posts, fork, spacer, headset etc. ) and titanium material for bicycle manufacturing (Gr.9/Gr.5 titanium tubing, rods, sheet ... etc. ). For more product information, pelase contact us. Titanium Bike Stem 31.8mm x 70/80/90/100/110/120mm(With Gold Titanium ...