Terms of the Trade: What Is a Fish Tape?
A fish tape, or draw wire or draw tape, is used in electrical work to direct wiring through walls and electrical conduit. Because the "tape" is actually a length of narrow spring steel, fiberglass, or nylon, it can easily be pushed and guided through small spaces inside walls. The tape has a hook or loop on the end with a fastener to attach to the guide string that was dropped inside the space. The guide string can then be pulled through different types of wiring.