T-Nut for 2020 V-Slot Aluminum Extrusion (Drop in - M3 Threaded)

From the shop's description

Drop in T-Nut is very useful because they need not to be placed from the end of the V-slot (like the conventional T-nut), but they can be easily placed any where in the V-slot. This means that you can use them even after mounting items at the ends of the V-slot T-slot Nuts are inserted into the aluminium profile grooves to connect one profile to another or to secure components to profile structures, allowing a clamping force for the screw in the groove. An essential for working with slotted aluminum extrusion, these slim metal nuts slide into the side-slot of the extrusion. The slightly oval shape means that as they screwed-into the nut and locked against the slot. Thread: M3 (used with M3 screws)