Fish hook with some form of corrosion-resistant surface coating. Corrosion resistance is required not only when hooks are used, especially in saltwater, but while they are stored. Additionally, coatings are applied to color and/or provide aesthetic value to the hook. At a minimum, hooks designed for freshwater use are coated with a clear lacquer, but hooks are also coated with gold, nickel, Teflon, tin and different colors. There are a large number of different types of fish hooks. At the macro level, there are bait hooks, fly hooks and lure hooks. Within these broad categories there are wide varieties of hook types
Fly-killing device rackets, which became popular worldwide in the late 1990s. US Patent 5,519,963 was awarded to Taiwanese inventor Tsao-i Shih in 1996 for such a device. The handle contains a battery-powered high-voltage generator. The circuit is composed of an electronic oscillator, a step-up transformer and a voltage multiplier, similar to the circuit in an electroshock weapon or stun gun, but with much lower power. The grid of the flyswatter is electrically charged to a voltage of between 500 and 1500 volts (V) of direct current, activated by pressing and holding a button. When the electrically conductive body of a fly nearly