Material alum alloy 6061-t6 per qq-a-225/8 (sm1869-32) or a380 or 380 per qq-a-591; finish for solderability per sd1063; all charachters marked per sb1198-46-06 or -77-06; ctr to ctr distance btwn mounting hoes 1.000 inch, mtg holes (2) diam 1/4-28unf-2b thd per mil-s-7742, 82 degrees csk to 0.310 to 0.330 diam