APPLY TO - For standard 20x20 aluminum profile extrusion slot., such as building industrial aluminum frame structures, 3D printers, CNC routers, CNC laser cutters, robotics projects, and moreSPECIFICATION:Overall Dimensions: 10mm(L)x6mm(W)x4.5mm(H)/0.39"x0.24"x0.18"Fit for Thread Type: M3 ThreadQUANTITY INCLUDED - 10pcs x M3 T-NutsADVANTAGE - Simply put the nut head into the groove in the direction of the profile groove, and rotate it 90 degrees clockwise, it can automatically lock when it is installed.
eBay