Gator Pro Harpoon Dart Penetrator - The driver is very strong and durable, made from ½in diameter stainless steel. It screws securely on to the floating, aluminum harpoon poles. The penetrator tip is 5/16in diameter. Used for penetrating Gator Pro Harpoon Darts with cable (G-101-C) or Big Game Darts with cable (M-1019C) deeply into the alligator for a solid connection.