The Optimizer continues to ride the wave of success after receiving the Bowhunting World and Archery Business Reader's Choice Award for a 4th consecutive season! Totally toolless micro adjust proved to be a big hit with consumers and allowed them to throw away the Allen wrench sets when sighting in. A 2nd generation slider sight the yardage dial replaces the traditional elevation arm for making precise yardage adjustments. Sighting in at 20 and 60 yards allows you to determine your customized yardage scale marked in one yard increments for pin point accuracy. New tool-free micro adjust CNC machined aluminum yellow sight ring for quick target acquisition Lens & light compatible 1 5/8" sight housing 3 feet of fiber optic.