Gold Tips Kinetic Kaos Shafts Dozen are a reduced-diameter shaft designed for durability and accuracy in wind and other inclement weather. Includes Accu-Tough inserts with Ballistic collar and GTO nocks with bushings. Per 12. Wt. tolerance: 0.5 gr. Recommended field-point size: 5/16 or 20/64. Size Spine GPI Dia. Length 500 .500 7.6 .258 30 400 .400 9.5 .270 30 340 .340 9.9 .273