titanium Gr2 and alloy titaniumGr5 Gr(Ti6Al4V Ti3Al2.5V). 2.According to your drawings and samples. Ti seat clamp, Ti seat clamp+nut,Ti derailleur adjustment bolt,Ti derailleur jockey wheel bolt,Ti crank bolt,Ti top cap,Ti dic brake adapter,Ti double banjo bolt,Ti banjo bolt,Ti spring,Ti bullet valve stem caps, Ti dura-ace brake mounting bolt,Ti crank arm dust caps,Ti brake lever bolt,Ti valve cover bolts etc. Ti6AL4V ID:31.8mm or 34.9mm, H:12mm aterial: 6Al/4V titanium Diameter: 31.8mm Specifications Top Quality of Titanium Bicycle Parts Titanium seatpost, titanium seatclamp, titanium headset, titanium fork, handlebar etc.. Ti fork26" Ti seatpost27.2/31.6mm*350mm-400mm Ti handlebar25.4/31.8mm*580/600mm Ti stem25.4/31.8mm*80/90/100mm Ti seat clamp31.8/34.9mm Ti headset1 1/8"