Not too long ago, the only reliable way to make a good connection between a terminal and a wire was to solder them together. As an alternative to soldering, wire wrapping technology was developed to give electricians a safe and efficient means to connect wires to terminals while still providing a high level of reliability. The method of wire wrapping is to coil the exposed wire around the sharp corners of a terminal under mechanical tension.
The use of wire wrapping puts a large amount of tension and compression forces on the terminal's edge to crush both oxide layers of the wire and terminal together. For the bond to occur about 100,000 PSI is needed at the terminals edge; the end result is an oxide-free metal-to-metal bond. Depending on manufacture specifications, a wire wrap with more turns or function may be needed. So to save time, pre-stripped wires can help by offering more reliability and determining the amount of turns that are needed, since a minimum number is required for wire function.