Features1[SPECIFICATIONS] Including 250pcs rivet nuts, with M3 M4 M5 M6 M8 M10 threads, sufficient in quantity, easy to use and replace. 2[304 STAINLESS STEEL] Made of excellent 304 stainless steel, resistant to high and low temperature and abrasion, not easy to deform. 3[FINE PROCESSING] The rivet nut is knurled, with deep thread and even inclination, and the surface is smooth without burrs. 4[EASY OPERATION] The rivet nut is easier to insert into the workpiece, suitable for machinery, bar equipment, steel pipe connectors, etc. 5[APPLICABLE MATERIAL] Can be easily installed into many different types of materials, including steel, plastic, fiberglass, etc.SpecificationItem Type: Rivet NutRivet Nut Model: M3 x 9mm; M4 x 11mm; M5 x 13mm; M6 x 15mm; M8 x 18mm; M10 x 21mmMaterial: 304 Stainless SteelProduct ModelM3M4M5M6M8M10Thread Diameter3mm 0.12in4mm 0.16in5mm 0.2in6mm 0.24in8mm 0.31in10mm 0.39inThread Pitch0.5mm 0.02in0.7mm 0.03in0.8mm 0.03in1mm 0.04in1.25mm 0.05in1.50mm 0.06inFlange Height0.9mm 0.04in1mm 0.04in1mm 0.04in1.5mm 0.06in1.5mm 0.06in2mm 0.08inFlange Diameter7.5mm 0.3in9mm 0.35in10mm 0.39in13mm 0.51in16mm 0.63in19mm 0.75inRecommended Aperture5mm 0.2in6mm 0.24in7mm 0.28in9mm 0.35in11mm 0.43in13mm 0.51inFull Length9mm 0.35in11mm 0.43in13mm 0.51in15mm 0.59in18mm 0.71in21mm 0.83inPackage List75 x M3x9mm Rivet Nut55 x M4x11mm Rivet Nut50 x M5x13mm Rivet Nut40 x M6x15mm Rivet Nut20 x M8x18mm Rivet Nut10 x M10x21mm Rivet Nut