Apple Archery Nock Alignment Tool. This is a truly nifty piece of equipment.á Maximize your bow performance by offsetting your nock properly.á Proper nock alignment insures that fletching will clear all bow components.á This tool will easily and consistently align nock to any fletching.á Location changes can be made in 1 degree increments up to 360 degrees.á The nock sits solidly on a hardened steel pin and the alignment finger can be adjusted up and down to accommodate different locations and types of fletching.á Once the positions are determined, all components lock securely to align any number of arrows.á Anodized aluminum construction with stainless steel locking screws.