The Blazer Jig's unique clamp system provides more adhesion force than standard fletching jigs. The Blazer Helix Jig includes a black clamp to fletch a 3 Right Helical on vanes up to 2.5" (63.5mm) long and is designed for standard size carbon shafts with an OD range of .293 - .306" (7.4 - 7.8mm). It's capable of 3 or 4 fletch (4 at 90 or at 60 x 120). The nock receiver on the Blazer Jig accommodates standard nocks.