0.187" hole diameter 4.000" overall length 7.125" overall width hour glass shaped aperture, 3.250 in.w by 1.687 in. h aperture one end, 3.000 in. by 2.750 in. aperture other end, 1.750 in. by 1.749 in. center aperture, two slotted holes 0.187 in.w oposite holes for pac aaub