Bitzenburger Dial-O-Fletching Jig -All metal design accommodates all arrow types and sizes. An adjustable self-centering nock receiver allows you to pick from three-fletch 120 degree, four-fletch 90 degree, or four-fletch 75 x 105 degree spacing. Adjustable Nock Receiver allows 120deg three fletch, 90 degree four fletch, 75 x 105 degree four fletchFor use with all types of arrow shafts and sizesAvailable in straight fletch and right helical