Did they include the sweet ball cap?With this type Perko.
Be careful, While it wont mate in reverse polarity, if fiddling with it, its pins can make contact reversed.
Fwiw, Thought I would try these plastic circular connectors on a floodlight project.
They not arrived yet. So far, no comment on their quality. But I think I used them before on import machine. Aside from a bit of flash left on its moulding, I thought were good quality.