ITEM NAME:180Pcs Carbon Steel T Nuts M3 M4 M5 T Slot Nut Hammer Head Nickel Fastener K8J2 180Pcs Carbon Steel T Nuts M3 M4 M5 T Slot Nut Hammer Head Nickel Fastener K8J2 1.100% brand new 2.Made from carbon steel, these nuts have high hardness and a long service life; Surface is Nickel-plated for good rust resistance and good performance 3.T nuts can be simply and securely fixed on the aluminum profile, it can be automatically positioned and locked 4.T slot nuts assortment kit; They can be directly into the aluminum slot hole in any of the assembly post, back spring ball can be fixed its position, making installation very simple and reliable 5.used for building industrial aluminum frame structures, 3D printers, CNC Routers, CNC cutters, Robotics Projects Description: Material: Nickel Plated Carbon Steel Size: M3 M4 M5 Color: Silver Application: For 2020 Series Aluminum Frame Structures Package Contents: 60 * M3T nut 60 * M4T nut 60 * M5T nut 4 * hexagonal wrench.Size: M3 M4 M5. Made from carbon steel, these nuts have high hardness and a long service life; Surface is Nickel-plated for good rust resistance and good performance. 4 hexagonal wrench. Material: Nickel Plated Carbon Steel.