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THIS PRODUCT IS NO LONGER AVAILABLE THROUGH THE MANUFACTURER. PLEASE TRY OUR OTHER LINE OF BROADHEADS MADE BY VORTEX.Aftershock Booster Arrow Enhancer. This is the only screw in Arrow tuning aid for every archery application. Now like never before you can custom balance your FOC and arrow overall length. Works with every arrow bolt point and broadhead built to ATA specs. The Booster screws into any AMO standard insert (including HIT) adding a precise 25 grains and 1/2" to total arrow length. Can be used with any broadhead or field point. Boosters are Stackable. Available in 6 packs of each. Made in the USA. Use the Booster to Tune FOC. Increase Broadhead Penetrtation Power. Fully Machined Ferrule Made of 7075-T6 Billet Aluminum with Type 3S Hardcoat. Increase Arrow Length. Available in .315" Diameter to Fit Most Carbon Arrows and .315" to .350" Taper Style for Most Crossbow Bolts.