This is a Gridfinity Bin for a Pro'sKit Hex Driver set (link below). The bin is stackable.
https://www.amazon.com/ProsKit-1PK-9402-Hex-Nut-Driver/dp/B003TPSF32/ref=sr_1_7?crid=GU19U0PW1UCZ&keywords=PROSKIT&qid=1698429896&sprefix=proskit%2Caps%2C153&sr=8-7