Description: Material: 6AL/4V(TC4)Titanium Alloy,Grade 5 Size: M4x10 13.5 15 20 25mm Wrench Size: Use 3mm Allen key Thread diameter: 4mm Head diameter:5.2mm Head Height :3.9mm Thread pitch: 0.7 mm Color: Titanium / Gold / Rainbow / Black Price is for Only 1 bolt.