Knob: The knob caps the top of the plunger rod so you have something to grip and press down on.
Plunger rod: The rod runs from the knob down through the lid to carry the filter assembly into the beaker.
Lid: The lid sits on the rim of the beaker and guides the rod straight down through its centre hole.
Spiral plate: The spiral plate is the top layer of the filter, and its coiled spring edge pushes the mesh against the beaker wall to seal it.
Mesh filter screen: The fine mesh sits between the two plates so it is clamped flat and held firm while it traps the grounds.
Cross plate: The cross plate is the bottom layer, and it screws onto the end of the rod to clamp the spiral plate and mesh together.
Glass beaker: The beaker holds the coffee and water, and the whole plunger assembly drops down into it.
Frame with handle: The frame sits at the bottom because the beaker is lowered into it, where it holds the glass and gives you a handle and feet.