About this item An incredibly simple and fast solution for shooters and hunters who have target opportunities at greater distances than their zero is set; Gives rapid access to an alternate zero HOW IT WORKS: Zero in your rifle at 100 yards, mount Second Zero onto your scope's bell or rail, flip lens down, hold crosshair directly on target at the Second Zero's prescribed distance, and shoot -- you're on at 100 yards and on at 330 or 530 yards When engaged, it shifts visual position of the scope's crosshairs to its additional zero; Compensates for holdover at a specified distance and increases long range accuracy Available in Picatinny rail or scope bell mount configurations as well as a 4.3 MOA/330-yard Zero or an 11.5 MOA/530-yard Zero (NOTE: Additional zero distances can fluctuate depending on ammo ballistics, equipment, conditions, and shooting technique) Multi-coated lenses; Recoil resistant; Requires NO batteries and works in all temperatures › See more product details