Pro version of the Nitro bolt features a straightness tolerance of +-.001â?쳌 and weight tolerance of +-.05 grains. Shafts weigh 13.9 GPI. Available in 22â?쳌 length only. Includes aluminum nocks and brass inserts (loose). Factory fletched with 3.5 in. vanes. Finished weight of 514 gr. with 100 gr. point.