Materials: Titanium Gr2,Gr5(6Al4V),Aluminum 7075-T6,6061-T6 Spec: M10,Total length33mm Treatments: Polished,Anodizing Titanium Ti Rear Derailleur Pivot BoltMaterials: Titanium Gr2,Gr5(6Al4V),Aluminum 7075-T6,6061-T6Spec: M10,Total length33mm Treatments: Polished,Anodizing(Blue,Gold,Red,Black)Weight: 4.9g(Al)