Talley 30ACI Anti-Cant Indicator 30mm Tube Diameter Aluminum Black Anodized
http://www.tandktactical.com/shop/876430009483-talley-30aci-anti-cant-indicator-30mm-tube-diameter-aluminum-black-anodized-26569
http://www.tandktactical.com/web/image/product.template/26569/image_1920?unique=e65e212
Tally Anti-Cant Indicator for a 30mm scope tube.
