It's a screw for the camera AND tripod (or other screw). what about it? well, I wasn't sure due to being a little expensive (in my opinion). In a hardware store in my street I got 20 1/4" screws (only the male part) for about 2€. well, they don't have the female part so I expected these kind to be more expensive.
It fits and screws perfectly in both male and female parts, the plastic has no rough edges and is very easy to use. So yeah, I'm glad and will buy a few more