The file 'T-nut M2.5 Drop-in Rotating T-Slot 5mm 3D Printer Model' is (stl) file type, size is 9.3KB.
M2.5 T-nut adapter for 20x20 or 20x40 T-Slot aluminum extrusion (5 mm gap)
Note: this design has not been tested. M2.5 has exactly 5 mm width and may fit tightly in 5 mm profile groove.