This Lehigh Valley sight is a excellent choice for a longrifle. Made in the U.S.A. from wax cast steel. Dovetail up to maximum of .062" deep, .500" long, by .620" wide for 1-1/8" octagon, or file to fit a 1-1/16" barrel. Height from the bottom of the dovetail to the top of the sight notch is 0.20".