If you're building anything with 20mm x 20mm '2020 series' aluminum extrusion (like for a 3D printer, CNC router, laser cutter, workbench, or robot frame), you need these T-nuts. They're the little pieces that slide into the T-slot channel of the aluminum profile and provide a threaded hole (M5 size) to bolt other parts onto. This pack gives you 50 of them, which is usually enough for a decent-sized project. They're made from nickel-plated carbon steel, so they're strong, have good hardness, and resist rust. The design is a 'sliding' or 'drop-in' T-nut with a half-round head that fits into the 6mm wide slot. They're super easy to use – you just drop them in and slide them to where you need them. Much easier than trying to align a separate nut inside the channel. Having a bunch of these on hand is essential for any aluminum framing DIY project. The quality is good, and the price for 50 pieces is very reasonable. A must-have component in the world of modular framing and maker projects.
