This medium size version of our Kit Carson's Hawken rifle sight is intended for a barrel up to 1" octagon. Tall, to reduce heat mirage, the center notch is indicated. Wax cast steel, made in the U.S.A., the dovetail is about .370" long and .580" wide. Dovetail to a depth of .050". Height from the bottom of the dovetail to the top of the sight notch is 0.26".