Alligator clips are great for firmly connecting wires without soldering. They can save ton of time for while testing. They are often used with multimeter as an extension to the test probes and make a good reliable contact.This is a pack of 12 leads in 6 colors 2 each of Red, Blue, Yellow, Green, Black and White. The wire length is 15", so it's good for jumping contacts or use with multimeters and other test equipments. They have a heavy 22AWG copper wire.