SparkFun PRT-11464 Quick Disconnect – Male 1/5″ (bag of 50)
These connectors are really useful as power connectors in prototyping or in projects that are repeatedly assembled and disassembled. There are also a variety of buttons and lights that use these standard connectors.
These Male quick-disconnects are about 1/5″ wide and can be crimped onto 22-16 AWG wire. Mating connectors can be found in the related items.