I use the spitfire broadheads and I absolutely love them they have a 1-1/2 inch cutting diameter. and they fly exactly like your field tips so you don' t have to resight them in just screw them on and go hunting. They are a little on the expensive side but very well worth it, they run about $30.00 for 3 of them. I highly recommend them. They are expandable heads and have 3 blades.