Sized to fit a longrifle with a 15/16", or 1" octagon barrel. Made in the U.S.A., the dovetail is approximately .635" long, .585" wide, cut to a depth of .050" or this sight is ideal to be fitted in a lifted dovetail. Wax cast steel. Height from the bottom of the dovetail to the top of the sight notch is 0.29".