Material: steel, corrision resisting type 303 or 303se, cond a, per specification qq-s-764; finish: black oxide per specmil-c-13924 cl 4; max diameter of 0.75in, diameter of 0.375in; height of 0.375inch; hole through center no.1 (0.1935) drill; counterbored to a diameter of 0.500inby 0.125in deep