The Big Jig fletches up to 4-Inch vanes with a 1 degree right helical. Easy set-up and simple operation. Includes 2 clamps and instructions. Places 3 vanes 120 degrees apart. Fletches most arrow shaft sizes. The Big Jig comes with both 4 fletch adapters, 90-90-90-90 and 60-120-60-120.