This full brass insert is designed to work perfectly with our Carnivore, Outlaw, Zombie Slayer, Vintage shafts. This insert allows for greater F.O.C. which is great for hunters looking for down range accuracy, increased kinetic Energy and momentum. The insert is also designed to work with our Carnivore, Zombie Slayer, Outlaw, Vintage Insert Weights and Screw-In Field Point.