Keeping your scope perfectly aligned is critical to long-range accuracy. Canting your scope, even just a couple of degrees, can cause error in point of impact. With modern ?Drop-Compensating? scopes, an Anti-Cant Indicator is a necessity. If your gun isn?t aligned correctly dialing up the turrets, or using hold-over marks, will just throw your shot off. This error can easily be enough to cause misses. The Wheeler Anti-Cant Indicator ensures that your rifle is always held near perfectly vertical, eliminating any chance for ?Cant Error? to cause a miss. Indicates precise, repeatable level gun position Increases accuracy by insuring proper gun alignment, which is critical for turret adjustment and hold over for bullet drop compensation Easy-to-view from shooting position Attaches to scope, folds in when not in use Precision machined aluminum with anodized finish.