Griffin Armament Scope Mount Ceramic Ball Level

From MidwayUSA

Constructed of aircraft grade aluminum with custom glass levels, the Griffin Armament Scope Mount Ceramic Ball Level achieves the same precise resolution of less than 1Adeg with line increments of 2.5Adeg. This allows a shooter to more consistently eliminate rifle cant, which can cause windage point of impact error especially at long ranges such as 800 meters when dope on the rifle may require ~25.5 foot hold overs. At 25.5 feet of aiming elevation, a mere 1.5 degrees of cant from level creates 8 inches, or nearly 1MOA at 800 meters of windage error on target.