I think it is called a turkey stopper, I have 1 and dont know what they are called it goes on behind your broadhead and has 3 wire prongs facing forward tworads the tip of your broadhead and slows down the broadhead to keep the arrow inside the bird..I have looked in cabelas and cannot find the actual one that I have and am talking about..I will check the muzzy website and see if I can find it...It doesnt nessecarily make a bigger hole it just slows the arrow down on penetration.