The Wheeler EngineeringA(R) Level-Level-Level is the simplest, most accurate scope leveling system out there. Misaligned crosshairs rob you of accurate bullet placement, especially at long range, where it counts. Crooked crosshairs cause your scope adjustments to be unreliable and even make zeroing your firearm a frustrating and costly experience. The Level-Level-Level works because the scope is leveled to your receiver, not to the top of a scope base. This scope mounting level works with practically any bolt-action rifle and is adaptable to there designs as well. Mfg: Wheeler Engineering