Innerloc Grapid Glow Max Arrow 5/16 in.. A control stud that extends out of the back of the tip engages the barbs selecting a shooting position or a new barb extracted mode. All you need to do to switch between modes is loosen or tighten the tip. Grapid's patent pending design allows for the tip to be removed and barbs fold forward for an alternate method of fish removal. An anti-vibration sleeve inside of the tip keeps the tip secure during the toughest days on the water. The premium Glow Max arrow will change night time bowfishing forever. Now you can easily track your shot see your fish or see to retrieve after a miss without relying on the boat's lights. 5/16" diameter. Package Contents: Innerloc Grapid Glow Max Arrow Innerloc 88570: Grapid Glow Max Arrow 5/16 in.