Mounts directly to the string stop rod on your bow

or 3D archers

and 3rd Axis

Decrease dynamic spine

Adjustable accessory tray on the lower level

Cross-X 4.2mm Comp Nock Pins Size:#1 Mounts directly to the stringCompatible with Hurricane, Maior, Helios, and Ambition shafts Available sizes: #1 6. 06mm OD, #2 5. 75mm OD, #3 5. 43mm OD Hurricane shafts: #3 pin Maior shafts: 350 400 spine use #1 pin, 500 800 spine use #2 pin, 900 1000 use #3 pin Helios shafts: 500 spine use #1 pin, 600 800 spine use #2 pin, 900 1000 spine use #3 pin Ambition shafts: 500 spine use #1 pin, 600 700 spine use #2 pin, 800 1800 spine use #3 pin Sold in a 12 Pack