uxcell M3 x 0.5mm x 1D Helicoil Wire Thread Repair Inserts Silver Tone 20pcs Product Name: Wire Thread Insert; Material: 304 Stainless Steel Weight: 1g; Package Content: 20 x Wire Thread Inserts Outer Thread Dia: 4mm/0.16"; Inner Thread Dia: M3 x 0.5mm Overall Length: 2mm/0.08"; Main Color: Silver Tone Metric Dia.: 1D; Fit Drilling Diameter: 3mm/0.12"