Uxcell a15052700ux0058 20 Pcs HSS 3 Straight Thread Flutes Screw Machine Metric Tap M3x0.5mm (Pack of 20) Product Name : MachineTap; Material : HSS; Accuracy Class : H2 Color : Silver Tone; Thread Type : Plug; Number of Flutes : 3 Flute Diameter : M3(3mm); Flute Length(Approximately) : 13mm / 0.5"; Pitch Size : 0.5mm