Top Quality Stainless Steel Rivet Nut Rivnut Insert Nutsert - Open end 1/4-20 UNC Large Flange, Knurled Body Material: Stainless Steel Body Diameter: 0.39" Head Diameter: 0.50" Total Length: 0.62" Application hole size: 0.391" Grip Range 0.027” - 0.150” Package: 20 pcs in a bag * PICTURE FOR REFERENCE ONLY.