Figure 1: Various banana leads available in the lab
Various safety banana leads for making connections in your circuits that are available in four different colors (red, black, blue and green). There is also shorter black leads that are available for making shorter connections. These leads are are rated to take at least 15 amps.
The longer red and black leads to the far left are voltage measurement leads used to measure the voltage on the Fluke 43B. These leads are not rated to take significant current so only use them to make voltage measurements.