This sight is designed to mount on Lyman and other mounting bases available for most 22 bolt action rifles. It features audible click detent ? target knobs scribed in quarter minute graduations ? elevation and windage arrows. Adjustable zero scales and elevation stop screw permit instantaneous return to zero. Quick release slide allows slide to be removed with a press of the release button. Large 7/8" non glare .040 aperture. Elevation adjustable from 1.060 to 1.560 above bore centerline.