25x39x2-BUTT-PLATE; about .996" wide, 1.527" high and .078" thick. The hole in the center is about .150" in diameter. It's slightly domed in shape. Butt plates are used at the pommel end of the handle, with or without an end nut. A particularly neat application is to file the end of the tang to a rectangle and file the hole to match. Or you can just file the tang to match the hole. Peen the end of the tang to anchor it.