Drop in T-Nut for V-Slot 2020 Aluminum Bar (4mm)

From the shop's description

Drop in T-Nut for V-Slot 2020 Aluminum Bar (4mm) is a high-quality electronic component designed for Arduino, prototyping, and educational electronics. This means that you can use them even after mounting items at the ends of the V-slot 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: M4 (used with M4 screws) It’s perfect for DIY makers, students, and anyone building custom electronic circuits or STEM kits.