A rivet nut, also known as a threaded insert or rivet nut, is a mechanical fastener that, as the name suggests, is a variation of the standard rivet. This one-piece threaded counter-bored tubular rivet can be anchored entirely from one side of the material in which it's installed. Used to securely fasten metals, fiberglass or rigid plastic materials by creating permanent threads and is for materials considered too thin for tapered threads. Features -Color: Silver -Material: Zinc zinc alloy -Size: 2.1x1.6x1cm/0.83x0.63x0.39in - The product comes with a plastic organizer box for storage, easy to carry. - Can be installed in many different kinds of material including steel. - Nuts have a work-hardened surface providing high-strength, load-bearing threads. - All the rivet nut are made of aluminum alloy, strong and durable. - You will no longer worry about them rusting and breaking when installing. Package list: 135 x Riveting Vertical Nuts 120 x Riveting Vertical Nut 120 x Riveting Vertical Nut M5 90 x Riveting Vertical Nut 60 x Riveting Vertical Nut M8 45 x Rivet Vertical Nut M10