Found on Church Hill, as it is known locally, where there was some Civil War activity, as well as an old house site. They measure 1.75 inches from center to center on the holes, the nut on the back is .5 inch square, and the one on the front is .75 x .75 x .187 thick. The total width is just over .625 of an inch. The plate with the two holes matches the brackets perfectly. All made of brass.