5 pieces of 80-pin, 2mm-pitch dual-row male headers.

This is not the common standard 0.1" pitch (that would be 2.54mm). These headers are for PCBs with the tighter 2mm pin spacing (0.079").

These are breakaway header strips, so you can snap them apart easily to get the length you need, e.g. 2×2, 2×3, 2×4, 2×5, etc.