Feature:1. Excellent Drilling Performance: Good quality high speed steel material, possess of sharpness drilling edge, low drilling resistance, smooth chip evacuation, long life2. Suitable for Handicrafts: Twist drill bits are suitable for electronics, handicrafts, jewelry, clock making, etc.3. Convenient and Easy to Carry: The bits are neatly stowed, convenient and easy to carry, you can take and use at anytime4. DIY, Home or Engineering Use: Twist bits are most suitable for DIY, home and general construction or engineering use, helps a lot5. Different Sizes from 0.4mm-3.2mm: 150Pcs drill bit set contain different sizes from 0.4mm-3.2mm, enough quantitative drill bits can meet your needs for regular replacementSpecification:Item Type: Twist Drill BitsMaterial: High speed steelDrill Bit Configuration List(diameter): 10Pcs Each: 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm5Pcs Each: 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 3.0mm, 3.2mmUses: Suitable for making electronics, handicrafts, jewelry, clocks and watches, etc..Package List:150 x Twist Drill Bits1 x Plastic BoxNote:1. Maintain an angle of 910 degrees when in use, not easy to damage.2. There is a tiny error due to manual measurement.