uxcell 20pcs Flat Head Metric Steel M8 Blind Insert Rivet Nut Flat Head Product Name: Rivet Nut; Material: Carbon Steel, Zinc Thread Diameter: 8mm; Grip Range: 0.5-3.5mm Body Diameter: 10.9mm; Total Length: 18mm Application hole size: 9.5mm; Weight: 114g Package Content: 20 x Rivet Nut; Color: M8x18L