It’s easy to create clean and durable accessory wiring connections. This kit contains a useful selection of sizes for a variety of 12V electrical applications. There are three sizes of connector blocks and pins, each of which has male and female components. Wires are crimped to the pins (soldering optional) and then the pins clip into the connector blocks... which are shaped to preserve polarity. The five small connectors take 20-24 ga. wire and are ideal for things like radar detectors or tiny LED voltmeters; the four medium connectors take 18-24 ga. wire and are suitable for things like GPS’s, radio receivers and those sorts of loads; and the four large ones take 14-20 ga. wire for articles like grip warmers, radio transmitters or illuminated arm jesters. Includes instructions and thirteen connector sets plus several extra pins in each size. (92 pieces total.) Warning: These connectors are the worlds best, but wiring and application errors can be costly. If you are in doubt about doing this sort of work, find someone knowledgeable to help. There’s nothing worse than letting the magic smoke escape from electronic devices.