Features: Made of high quality carbon steel and zinc plated, sturdy and durable. The knurled nut makes it easier to insert into the work piece. Can be easily installed in many different kinds of material including steel, plastic and fiberglass. Great rivet nut installation tools to make work easier and quickly. Comes with a plastic organizer box for storage. Specification: Material: Zinc Plated Carbon Steel Type: Flat Head Diameter: 3-10mm Weight: Approx.457g/ 16.1oz Size: M3/M4/M5/M6/M8/M10 Quantity: 180pcs Package List: 50 * M3 Rivet Nut 50 * M4 Rivet Nut 30 * M5 Rivet Nut 30 * M6 Rivet Nut 10 * M8 Rivet Nut 10 * M10 Rivet Nut 1 * Box Note: Please allow slight error due to manual measurement. Thanks for your understanding. 1Made of high quality carbon steel and zinc plated, sturdy and durable. 2The knurled nut makes it easier to insert into the work piece. 3Can be easily installed in many different kinds of material including steel, plastic and fiberglass. 4Great rivet nut installation tools to make work easier and quickly. 5Comes with a plastic organizer box for storage.