This is a enclosure for projects that you want to plug into an electrical outlet. You can get electrical blades from any suitable electrical appliance. The ones I used were from these Lutron brand replacement plugs:

https://thd.co/2hc4x5k

There are also stand offs spaced for 4 x 6 cm prototype boards like this one:

https://www.amazon.com/25Pcs-Double-Sided-Protoboard-Prototyping/dp/B01N78ETXO/ref=sr_1_2?ie=UTF8&qid=1509208526&sr=8-2&keywords=prototype+board+4x6