Mini tap and die set to make your own screw and nut in sizes from 0.6mm to 1mm. First drill a hole smaller by one size and tap to cut the thread. Use a disposable syringe or pipette with lubrication oil to die plate adjoining hole to prevent seizing and breaking the tapping die. Go slow forward and backward to free the cutting debris.
Good for scratch building automata, mechanical scale modelling, engineering prototyping, watch screw rethreading.