DESCRIPTION ST AXIS The favorite choice for serious bowhunters looking for deep-penetrating big game performance. New AXIS arrows are the first ever to utilize carbon nanotubes for increased strength compared to ordinary carbon arrows. Hidden Insert Technology aligns broadheads for tighter groups. SIZES 300, 340, 400, 500 Internal-fit \"X\" Nock - installed HIT Insert, chamfer stone, installation tool, HIT epoxy - Included Points and broadhead adapter rings - Sold separately Note: One size HIT Insert fits all ST Axis shaft sizes.