This is a truly nifty piece of equipment! Maximize your bow performance by offsetting your nock properly. Proper nock alignment ensures that fletching will clear all bow components. The Apple Nock Alignment tool will consistently and easily aligns nock to any fletching. Location changes can be made in 1° increment up to 360°. 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. Once the positions are determined, all components lock securely to align any number of arrows. Anodized aluminum construction with stainless steel locking screws.