These trays are designed to hold standard ¼ inch hex driver bits.  There are 7 variations for holding different combinations of bits.  The unlabelled trays have space for writing or sticking your own label.

1. US (1 row, 10 bits) — hex key 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4"
2. Metric (1 row, 6 bits) — hex key 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm
3. US and Metric (2 rows, 20 bits) — #1 and #2 above plus Phillips #00, #0, #1, #2
4. Full (3 rows, 30 bits) — #3 above plus slotted (3/16", 1/4"), Torx (T6, T7, T8, T9, T10, T15), square (#1, #2)
5. Unlabelled (1 row, 10 bits)
6. Unlabelled (2 rows, 20 bits)
7. Unlabelled (3 rows, 30 bits)

STL files.  STL files are also provided for each tray variation.  In the STL files of labelled trays, the lettering is represented as separate bodies to make it easy to assign different colors in your slicer software.