Titanium Countersunk Flush Head 1/2 - 20 x 1". Grip Length = 1/4". Thread Length = 3/4". The heads have been forged and the threads have been rolled for better fatigue resistance. Made from Aircraft grade material that has been heat treated to a Minimum UTS of 160Ksi and has been ultrasonic inspected. Commonly used for Sprint & Midget Left Front Rotor Bolts.