Tower fletching jig allows you to fletch all three vanes at once. Includes 3 sets of arms – Straight (Up to 4” vane), 1 degree offset (Up to 4” vane), and 3 degree right helical (Up to 2.25” vanes). Center posts for standard carbon, F nock, A nock, HE nock, pin nock, and crossbow bolts are also included. Two different clamping rings accept any size arrow shaft.