These are gridfinity bins for the milwaulkee 6 & 10 inch pliers sold together as model number 48-22-6330. Gridfinity is an organizational system invented by Zack Freedman. 

Heads up! The larger bin for the 10 Inch pliers are on a half grid - I know it's a bit awkward, but otherwise it wouldn't fit on the build plate as a single print. I'll have a few half grid models coming out that you can use to set next to it. 

These bins are 4U tall - are not stackable - do not have magnets. Let me know if you need a modification! 

Happy printing.