Titanium Hex Head M8 - 1.25 x 55mm. Grip Length = 0. Thread Length = 55mm. The drive on this bolt is a 10mm Hex. These bolts have been designed to replace OEM M8 chain adjusters. The heads have been forged and the threads have been rolled for better fatigue resistance. Made from aircraft grade material that has been ultrasonic inspected and heat treated to a minimum UTS of 160Ksi (1103Mpa).