Technological advances in today's modern firearms, ammunition and optics have enhanced the potential for long range accuracy. However, precision mounting and alignment of your system's scope is critical to realizing that potential. A scope's reticle must be precisely aligned with the barrel to ensure holdover or turret adjustments for bullet drop produce true vertical compensation for point of impact. If the crosshairs are canted left or right both elevation and windage bullet impact error can occur. The Wheeler Engineering Professional Reticle Leveling System is a precision tool designed to allow a scope to be perfectly leveled on any firearm with ease. CNC machining, factory adjusted calibration set screws, anodized aluminum construction and protective molded case put this instrument in a class of its own. The system is comprised of two machined aluminum level housings calibrated to their integrated levels.Specifications and Features: Prop 65 Reproductive Harm: Generic