Mounting board.
Circuit Tester
These and a metal plate – https://www.amazon.com/gp/product/B0BR4KV3YW/ use for things like Laser and Photosensor . . .
They do make male/female of these – nice for later in work – https://www.amazon.com/Treedix-Alligator-Breadboard-Jumper-Alligato/dp/B0BLH66X3B