Specification:Material :HSS4241.Shank:1/4"(6.35mm) hex shank.Head Diameter:M3,M4,M5,M6,M8,M10.Note:Due to lighting effects, monitor's brightness , contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item.Please allow 1-2mm differs due to manual measurement, thanks.Package Included:6pcs x Titanium Hex Plug Tap Drill Bits