For X/ A/ 5mm/ .204 size shafts. Grain Weight: 9.2 grains Each nock has only one single mould for the tightest tolerances and the highest precision. Nock grove shaped to prevent pinching the string for a consistent release. Simple to install with an easy push-fit design. Suitable for many popular shafts from brands such as Black Eagle, Victory, Easton and GoldTip. Available in: Asymmetrical design, made specifically for the most accurate shooting with a recurve from the fingers. Symmetrical design (Hunter), made specifically for the most accurate shooting with d-loop