Quick Disconnect - Male 1/5" (bag of 50)

via SparkFun
SKU SF-PRT-11464

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.