This is a pair of Deans-type connectors — one male, one female — that you can use for powering your project. These types of connectors are used commonly with remote-controlled vehicle batteries. They offer less resistance than many other common types of power connectors.
With this M/F Deans-type connector pair, you'll have just what you need to safely and securely connect your battery or anything else that requires a mini T Plug.
Each pack comes with one male and one female Deans-type connector, each of which can support a current of up to 30A.
Note that these are not genuine Deans brand parts.