Steel per mil-s-6050, comp 8630, cond n or mil-s-6758, comp 4130, cond n; 0.860 in. Lg o/a; first end 0.310 in.Sq by 0.300 in. Lg w/0.125 in. Diameter hole through by 0.060 in. Lg by 45.0 degrees chamfer; second end 0.450 in. Lg by 0.160 in. Diameter w/0.040 in. Lg by 45.0 degrees chamfer