Want to hold small steel nuts, bolts nails etc so you can spot weld them together for student projects ie little figures.
are the perfect answer. They also attach them selves to a steel bench via side magnets....very cool.
Sheet metal is an inexpensive materials for designing student Projects. Onshape (online CAD can help in a big way with their Sheet Metal App. I imagine that it could be also used for Cardboard Engineering or Plastics Projects in fact anywhere you might need to create a Development or Net. Free to education and use on any simple laptop