Steel, body 0.562 in.O/a lg, thd 0.218 in.Lg, head 0.125 in.H, 0.468 in.Od, slotted 0.062 in.W, 0.062 in.W, 0.062 in.Deep, center bored 0.250 in.Approx 0.375 in.Deep, other end 0.296 in.Od, needle 0.593 lg.O/a, 0.125 in. Od before taper, three sided, 0.187 in.Across flats