For Fixed-Blade shooters who demand extreme accuracy and ruggedness, the NAP Thunderhead is the perfect broadhead. Compact, nail-tough and honed to the pinnacle of hemorrhagic performance, it will never let you down.Features3 Replaceable blades with 1 3/16" Cutting diameterNearly Indestructible All Steel constructionHigh-Speed tested to deliver maximum penetration and performancePinpoint accuracy- Even with today's fastest bows and crossbows