Three independently micro-adjustable vertical pins are coupled with corresponding individually adjustable pointers enabling the archer to pick their "zero'd" pin positions and continue to know the yardages to each, know matter what the dial is adjustaed to. Perfect for the archer that likes the single up pin sight picture, but doesn't like the limitation of a single aiming pin. The Triple Stack lets you set the gaps for all three pins and once set to match, the adjustable pointers provide constant yardage updates as the dial is turned.