Product description: Material: nickel-plated carbon steel Color: Nickel plated color Head type: Hammer head Thread: M3 M4 M5 Weight: 250g Quantity: 180 Pieces Package Included: 1 x Box 4 x Hex Keys 60 x M3 T Nuts < p>60 x M4 T Nuts 60 x M5 T Nuts Sturdy and durable: high quality carbon steel T-slot nut, these nuts have high hardness and a long service life; The surface is nickel-plated for good rust resistance and good performance. Easy to install: place the T-nut directly into the groove of the profile and rotate it 90 degrees in the direction clockwise. It can be automatically positioned and locked during the installation process. Ideal for installing corner pieces and other profile accessories. Wide application: Suitable for 2020 series aluminum profile, widely used for building industrial aluminum frame structures, 3D printers, CNC routers, CNC laser cutters, robotics projects, etc. Portable combination: the package includes 2020 series M3x60pcs, M4x60pcs, M5x60pcs, total 180, with 4pcs hex keys, can meet your different needs, and stored in a transparent plastic box, convenient for your storage and use. < p>Humanized design: Designed with smooth cut corners, the T-nut slides easily into the T-slots and locks very firmly. Threads are smooth and precise for effortless installation.