XS Ghost Ring sight set allows for quick acquisition of targets and improved accuracy. The aperture of the Ghost Ring is adjustable for windage and elevation. Windage can be adjusted by opposing windage screws, this provides 14" of adjustment at 100 yards based on a 24" sight radius. Elevation is adjusted by loosening one windage screw and turning the rear aperture clockwise or counterclockwise to move the aperture up or down; the stem of the aperture is threaded. Each 180 degree turn of the aperture moves the bullet point of impact 1" at 100 yards. Sight provides 16" of adjustment at 100 yards based on a 24" sight radius. The XS Sights Ghost Ring Sight Set is great for any hunter that perfers to hunt in brushy or heavily forested areas. Includes: Screws, thread locker, both .230" and .191 inside diameter rear apertures.