Featuring four identical razor-sharp stainless steel fixed blades that are held in place through the force of initial impact by NAP's revolutionary X-lock blade system, the NAP Quadcutter Broadheads are built to kill. Their one-piece CNC-machined titanium ferrules ensure retained momentum for plowing through soft tissue and into animals' vitals, while the .031 replaceable blades slice holes up to 1-3/16" in diameter for bringing game down surely and swiftly. Each 100-gr. broadhead is thoroughly spin-tested for optimal flight performance. Includes one set of replacement blades. Single piece CNC-machined Grade 5 Titanium ferrule 4-blade design creates a large wound channel X-Lock System ensures blade retention .031 thick, razor-sharp replaceable stainless-steel blades Individually spin-tested Practice blades included 1 3/16 cutting diameter 100 grains