This is a very basic dibble plate to create 8 furrows in a 6c seedling container (6 containers fit in one 1020 nursery flat) to allow for quick, organized seed sowing and easy pricking out once germinated.
Glue any old thing to the top to serve as a handle (I use busted bits of failed prints or scraps of wood).

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/5H4VXySivss