Good Performance. This flat head rivet nut has good performance of fastening function, Can be easily installed in many different kinds of material including steel, plastic and fiberglass. Sturdy and Durable. Made from 304 stainless steel providing strength, it has a sturdy body without rusting properties. Nuts have a work-hardened surface providing high strength, load-bearing threads. Professional Design. The ribbed body provides better torque-to-turn resistance than conventional, non-ribbed rivet nuts, features a large bearing surface it helps to improve the bit retractable ability. Various Sizes. There are various sizes, M3, M4, M5, M6, M8, M10 for choices, comes with a practical plastic box, easy to organize and use next time, makes the job easier and faster. Feature - Rivet Nut Tool Set/Installation: Manual/Pneumatic type available. Perfect for professional and home use. - Integrated function. The rivet screw often has a built-in feature, such as a slot, that makes it easier to tighten the fastener. - High quality for durable and long-lasting use. Lightweight for portable installation. Specifications Material: 304 Stainless Steel Color: Silver Size: M3, M4, M5, M6, M8, M10 Type: Flat Head Rivet Nuts Item Quantity: 165pcs Condition: Brand New Package Includes 50 * M3 Rivet Nut 50 * M4 Rivet Nut 30 * M5 Rivet Nut 20 * M6 Rivet Nut 10 * M8 Rivet Nut 5 * M10 Rivet Nut