The only jig with a helical that is designed to fletch a 2â?쳌 vane. Designed for standard 19/64â?쳌 diameter carbon shafts, this jig will give you the perfect helical for the Blazer or any other 2â?쳌 style vane. The Blazer jig has a pre-set 3 degree helical built into the clamp and the jig places 3 vanes 120 degreeâ??s apart. Comes with jig, clamp and instructions.