Titanium Button Head M4 - 0.70 X 8MM. Grip Length = 0mm. Thread Length = 8mm. The drive on this bolt is a 2.5MM Allen/Hex Key. Head Diameter is 7.5mm. The heads have been forged and the threads have been rolled for better fatigue resistance. Made from Aircraft grade material that has a Minimum UTS of 140Ksi (925Mpa).