Description: Made of high quality carbon steel material,durable,sturdy,providing high-strength, load-bearing threads. Rivet Nut Insert Rivnut Nutsert Assort M3 M4 M5 M6 M8 M10 M12. Easy and convenient to install and use. Suitable for fix tub, mount storage containers against the tail gate and anchor on the wheel wells. Application:Many kinds of heavy duty materials including sheet metal, steel, aluminum, plastic, fiberglass etc. Specification: M3 Inner Dia.Approx.4.9mm/0.19in;Outside Dia.Approx.8mm/0.31in;Height:Approx.9mm/0.35in M4 Inner Dia.Approx.5.9mm/0.23in;Outside Dia.Approx.9mm/0.35in;Height:Approx.10mm/0.39in M5 Inner Dia.Approx.6.9mm/0.27in;Outside Dia.Approx.10mm/0.39in;Height:Approx.13mm/0.51in M6 Inner Dia.Approx.8.9mm/0.35in;Outside Dia.Approx.12mm/0.47in;Height:Approx.15mm/0.59in M8 Inner Dia.Approx.10.9mm/0.43in;Outside Dia.Approx.14mm/0.55in;Height:Approx.18mm/0.71in M10 Inner Dia.Approx.12.9mm/0.51in;Outside Dia.Approx.16mm/0.63in;Height:Approx.21mm/0.83in M12 Inner Dia.Approx.14.9mm/0.59in;Outside Dia.Approx.18mm/0.71in;Height:Approx.24mm/0.94in Package Includes: 120pcs Package :50 x M4 rivet nuts,35x M5 rivet nuts,15x M6 rivet nuts,10x M8 rivet nuts,10x M10 rivet nuts. 180pcs Package:50x M3 Steel Ribbed Nuts,40x M4 Steel Ribbed Nuts,30x M5 Steel Ribbed Nuts,25x M6 Steel Ribbed Nuts ,20x M8 Steel Ribbed Nuts,10x M10 Steel Ribbed Nuts ,5x M12 Steel Ribbed Nuts. 300pcs Package:90x M3 Steel Ribbed Nuts,65 x M4 Steel Ribbed Nuts,50x M5 Steel Ribbed Nuts,40x M6 Steel Ribbed Nuts,30x M8 Steel Ribbed Nuts,20 x M10 Steel Ribbed Nuts,5x M12 Steel Ribbed Nuts. 150pcs Package:40pcs M4x11mm rivet nuts,40pcs M5x13mm,30pcs M6x15mm,20pcs M8x18mm,15pcs M10x21mm,5pcs M3x 9mm