CRAFTMEmore Grommet Tool Eyelet Punch Setter Anvil and Hole Punch Cutter for Applying 0.16" (4 mm) Grommets (0.16" (4 mm))

hello - how do I use it? I ordered this but can't figure out how to turn the gromlet into a ring, even when pressing hard as shown in the instruction

how heavy is the anvil, is it solid or hollow?