Extra seeds roll to the side when dropped & easily dispense back into your bottle of seeds through the return port (small circle in frame).
Seed plates with smaller holes than the bottom let's them drop right down! Bottom (Drop) Hole Plate size: 7mm (only size available for the drop (bottom) plate).
If you are unsure what size best fits your seed, you can ask us and we will do our best to compare what we have on hand and documented thus far. If you have ruler, measure the seed at its widest.
If a seed appears to be 3.5mm - go with a 4mm plate.