Answer:
Scythe of darkness, Shadow’s light. Guiding eye of thirteenth sight.
I open wide and tight I shut, Sharp am I and paper-cut fingers too, so do take care, I'm good and bad, so best beware.
This is rectangular, hollow and has a lid, and where you’ll find it you might wonder, it is just six feet under. What is it?
Different lights do make me strange, thus into different sizes I will change
In Paris but not in France, the thinnest of its siblings.
What did the piece of wood say when he saw the screwdriver and screws approaching?