Steel per federal specification qq&t&570, hardness rating 56 to 60 rockwell c scale, 0.434 in. O/a lg, 0.093 in. Diameter of 1st step, 0.088 in. Diameter of 2nd step, 0.093 in. Diameter of 3rd step, 0.934 in. Taper to 0.045 in. Diameter of 4th step, 0.012 in. Diameter of pivot point
