Vertical fletching jig accommodates all standard carbon, small diameter carbon, large diameter carbon, and aluminum shafts up to 23/64â?쳌 O.D. Designed to work with arrows that have a press fit nock system. Places 3 vanes on a 3 degree right helical at 120 degrees apart and includes two pressure rings allowing you to apply the perfect amount of pressure on different diameter shafts. Jig will only work with vanes up to 2 inches in length.