The Helix Tower® is a fletching system that accommodates all size arrows from small carbon X10s up to Fat Boys and allows you to fletch 3 vanes at once precisely 120° apart, and reduces your fletching time to a third! Includes 5 interchangeable center posts to accommodate Standard nocks, Pin nocks, F nocks, A nocks and Crossbow nocks. Two collar rings are included: red for use with small carbon up to aluminum shafts, green for use with fat boy shafts. The Helix Tower® includes clamp release tape and 1 sets of 'arms' to fletch up to 2.25" long vanes on a 3° right helical. The Tower® saves time, increases arrow production and provides the easiest and most precise vane placement! All Tower® system arms are compatible with the Tower® Jig base, replacement or additional arm sets are sold separately.