2. Made of high quality carbon steel, have high hardness and a long service life
3.Suitable for 2020/3030 series aluminum profile, widely used for building industrial aluminum frame structures, 3D printers, CNC Routers, CNC laser cutters, robotics projects
4. Package includes: 2020 series M3x20pcs/M4x20pcs/M5x20pcs , 3030 series M4x20pcs/ M5x20pcs/M6x20pcs ,Total 120pcs
5. All pieces Come in a Transparent Storage Box, Easy to Store