ITEM NAME:5* HSS Titanium Screw Thread Metric Spiral Plug Tap Drill Bit Hand Tool M3-M8 cv.Size: Specification: M3 0.5mm, M4 0.7mm, M5 0.8mm, M6 1mm, M8 1.25mm. Material: HSS High Speed Steel 6542. Color: Titanium Plating. We'd like to settle any problem in a friendly manner. We want to make sure you are happy with our item.