Mounted into the tang on a ½” hollow post to 5/8”; sight shat fits into the hollow post. Elevation adjustment with a screw/leaf vertical adjustment, or by releasing a screw on the side of the base mount to gain additional ½”. Height before tang elevation is 1 ½”; after, 2”. Windage adjustment with screw/leaf horizontal movement. Blued steel with top mounted adjustment screws left “in the white.” Standard equipment on Mortimer Whitworth Target Rifle.