Gridfinity 4x1x3 socket holder, set of 8: 8, 10, 12, 13, 14, 15, 17, 19.
Designed for SK11 (Amazon) but should fit others, I guess.
Used GridfinityGenerator to generate solid bin.
The author remixed this model.
The general shape is inspired by Zack's model. It didn't fit my bits.