The Big Jig's unique clamp system provides more adhesion force than standard fletching jigs and it is large enough to accommodate fletchings up to 4" (101.6mm) long. It includes two clamps to fletch either a 3° Right Helical (black) or a 1° Right offset (red). It accommodates standard shafts from .293 - .306" (7.4 - 7.8mm) OD and is capable of 3 or 4 fletch (4 at 90° or at 60° x 120°). The installed nock receiver on the Big Jig accommodates standard nocks. Nock receiver for crossbow bolts also included.
U.S. Patent 8,286,953 B2