Anvil Parts Organizer Stacking Bin - 2 Compartment

They fit most compartments in these parts organizers. They have 2 compartments each for very small quantities of parts, and they stack 2 high for even better density. https://www.homedepot.com/p/Anvil-17-Compartment-Black-Interlocking-Small-Parts-Organizer-2-Pack-320034/321084142