These professional T-nut are practical fastener for 3D printer, machine guards, workstations, aluminum extrusion, can be positioned and the right installation process. Adopting aluminum alloy materials, it is safe and sturdy for . Often used in combinations with hexagon socket bolts to assemble corner pieces to give you much more convenience. Features - Color: silver. - Material: aluminium alloy. - Size: 1.40X0.80X0.50cm/ 0.55X0.31X0.20inch. - Note: European standard M6 metric type, suitable for 20x20mm aluminum extrusion t-slot 6mm. - With simple structure, it is easy to use and connect between aluminum profiles and other parts. - Adopting aluminum alloy materials, it is safe and sturdy for . - These nuts can be practical fasteners for 3D printer, machine guards, workstations, aluminum extrusion. - Excellent corrosion and abrasion resistance, easy to operate, will not deform or break easily. - The rear spring ball can be fixed in position, making installation very simple and reliable. Package list: 50 Spring Nuts(M6)