uxcell M8 Thread Aluminum Rivet Nut Insert Nutsert 20pcs Thread Size: M8/0.3"; Product Name: Rivet Nut Material: Aluminum; Weight: 40g Package Content: 20pcs x Rivet Nut; Main Color: Silver Tone Height: 18mm/0.7"; Head Diameter: 15x9mm/0.6"x0.35"(Outer.D*Inner.D) Head Thickness: 2mm/0.08"; Outer Knurling Size: 11x8mm/0.43"x0.3"(D*L)