Grayling Fletching Jig and Straight Clamp. On the Grayling Fletching Jig the adjustable nock receiver is pre-set for three-fletch arrows. The nock receiver fits all size nocks. The fletching clamp fits snugly to the shaft allowing for a clean glue line every time. A heavy-duty magnet ensures secure positioning. constructed of glass-filled nylon for long-lasting life. The Grayling Fletching jig is available in straight, right or left-handed.