Used on 2350-01-087-1095 armd battle tankm1e1; m11a and m1. 0.310" hole diameter cwidth is 1.000 in constant. 19 holes asymetrically located. not an equilateral triangle. both surfaces rubbercoated fully cured. base length 12.940in nom, lt side 7.120 in nom, rt side 9.180 in nom triangle