slot nuts with good texture and practical functions are made of aluminum alloy materials. With detailed workmanship, they are good for rust resistant and wear resistant, can satisfy your needs. Widely can be used for most applications like 3D printer, , engraving machine and more. Easy to install and dissemble, lightweight but sturdy. 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. - These nuts can be directly into the aluminum slot hole in any of the assembly posts, back spring balls can be fixed in its position. - Made of aluminum alloy material, these nuts are safe and for long time to use, have high hardness. - Widely applied for 3D printers, engraving machine, CNC Routers, robotics projects and so on. - Adopts precision production to maintain stable characteristics and high reliability, easy to install and store. - It is the one of most important accessories in the aluminum profile connection for better using. Package list: Nuts(M6)