Feature: 1. Made of carbon steel, durable screw nut set can be corrosion resistant, improved for more durability. 2. Complete specifications, suitable for car maintenance, mechanical maintenance, household. 3. Plastic box packaging, multiple grids are convenient for classification, convenient for storage and carrying. 4. Mainly used for the fastening connection of aluminum profiles, such as the fastening connection between square multi‑slot aluminum profiles. 5. 560pcs screw nut set can meet your need and their quality is guaranteed, you can use it with confidence. Specification: Item Type: Screw nut set Material: Carbon steel Quantity: 560pcs Uses: Mainly used for the fastening connection of aluminum profiles, such as the fastening connection between square multi-slot aluminum profiles. The compression surface of the pan head hex socket screw is larger than that of the cylinder head hex socket screw, and the connection contact surface is larger. The hex socket head wrench is easy to fasten and can be reliably connected to frame composed of aluminum profiles.Size: Approx. 3mm / 0.1in Approx. 8mm / 0.3in Approx. 12mm / 0.5in Approx. 16mm / 0.6in Approx. 20mm / 0.8in Approx. 4mm / 0.2in. Package List: 35 x Screw (M3 x 8)35 x Screw (M3 x 12)35 x Screw (M3 x 16)35 x Screw (M3 x 20)20 x Screw (M4 x 8)20 x Screw (M4 x 12)20 x Screw (M4 x 16)20 x Screw (M4 x 20)10 x Screw (M5 x 8)10 x Screw (M5 x 12)10 x Screw (M5 x 16)10 x Screw (M5 x 20)160 x M3 Nut 80 x M4 Nut50 x M5 Nut