The Dewalt DWA1450 tap and die set does not come with any way to store all the pieces so I designed this tray to keep all the parts together. Tolerances are not amazing on these parts, my M7 die is a bit bigger than the rest and fits a bit more snugly in its slot. If you have any issues let me know and I'd be happy to adjust the model if any of your parts don't fit correctly. I printed mine with Inland PLA filament.