Features:Can tap the bottom of the bline hole.Cutting cannot remainCan easy eating into the bottom of the holeGood machine abilitySpecifications:Material: HSS Surface treatment: TiColor: As the pictures showedType Size:M3/4/5/6/8Length: as the picture shown(approx)Weight: 41gThread Direcation : Right handPackage Included:5 pcs Titanium screw taps��M3/4/5/6/8)