Product Details: Material: 6AL/4V Titanium Alloy (Gr5) open with allen key inner hex Specification: M5 x 10/12mm(length 16 18 20 diameter:M5 M6) Weight: about 2g/pcs Color: Gold/rainbow/blue/black/silver/mauve/green Package include: 12pcs/lot in package with M5x10/12mm Titanium Bolts