Features: brand new high quality Made of high quality material, durable 1/4"-20 Stainless Steel Rivet Nut Fastener Threaded Insert Nut Rivnuts, 1/4-20UNC, Flat (Knurled) Stainless steel lock nuts, strong enough to meet your requirements for various applications in home furniture, decoration, automotive, electrical and industrial products. Rivet nuts can be used on heavy materials such as steel, sheet metal, aluminum, plastic, and fiberglass. Each rivet nut is made with a knurled round body. Product parameters: Thread size: 1/4"-20 Material: Stainless steel Body diameter: 8.9 mm/0.350 inches Grip range: 0.5mm-3mm/ 0.019”-0.118” Head Diameter: 12.3mm/ 0.490" Head height: 1.3mm/ 0.052" Application hole size: 9mm/ 0.351"-0.356" Overall Length: 15.5mm/0.610in Head type: flat head Color : Silver Package Included: 40 * stainless steel rivet nuts Note: 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow slight manual measurement deviation for the data. Our products are made of environmentally friendly materials, safe and non-toxic, and will not cause harm to the human body. Please read the product manual carefully before purchasing, and use it correctly according to the operation steps. If you encounter any difficulties or problems during use, please contact us in time, we will solve them for you as soon as possible. Your support is the driving force for us to move forward, and we look forward to sharing your experience and experiences with us. For the quality problems or defects of the product itself, we will provide unconditional return or repair service.