FeraDyne Outdoors Muzzy Iron 2 Barb Arrow- The Muzzy Classic is constructed from 5/16in diameter fiberglass and comes with the point and the nock already installed. This arrow is also drilled for easy installation of a safety slide. 5/16in Diameter solid fiberglass shaft Nock installed Iron 2-Blade point installed 2 Quick Turns of the Tip Releases the Barbs Safety Slide Installed