Aazon.co: Hotronic Footwarer Extension Cords 20pcs Blind Rivet Nut Insert Assortment Kit 304 Stainless Steel Thread pitch: 5/16 inch-18 , 5/16-18UNC. Application Drill Hole: 0.421-0.426 inch(10.7mm-10.8mm). Head Diameter: 0.58 inch(14.8mm); Total Length: 0.7 inch(18.9mm) Package Include 40pcs 5/16-18 Stainless Steel Rivet Nuts. Size:5/16-18 | Color:304 Stainless Steel Rivet Nuts 5/16''-18 Stainless SteelThreaded Insert Nutsert Rivnuts 5/16-18UNC Flate Head A Rivet Nut... Thread pitch: 5/16 inch-18, 5/16-18UNC Application Drill Hole: 0.421-0.426 inch(10.7mm-10.8mm) Head Diameter: 0.58 inch(14.8mm); Total Length: 0.7 inch(18.9mm) After Sales Service If you have anything concerned with the Stainless Steel Rivet Nuts after use, please first to choose contact us and we will take care of it for you. Package Include: 40pcs 5/16-18 Stainless Steel Rivet Nuts Metric Rivet Nut Stainless Steel Rivet Nuts, 40 Pieces Flat Head Threaded Insert 5/16-18 Rivet Nut