This set is in 1/700 scale. The individual Guided Missiles have their own rails to attach to the under side of an aircraft's wing. The Guided Missiles should be cut from the sprue at the top of the rail system.
According to Wikipedia: "The Harpoon is an all-weather, over-the-horizon, anti-ship missile system, developed and manufactured by McDonnell Douglas (now Boeing Defense, Space & Security). In 2004, Boeing delivered the 7,000th Harpoon unit since the weapon's introduction in 1977. The missile system has also been further developed into a land-strike weapon, the Standoff Land Attack Missile (SLAM)."