1、Excellent Drilling Performance: Good quality high speed steel material, possess of sharpness drilling edge, low drilling resistance, smooth chip evacuation, long life 2、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 anytime 4、DIY, Home or Engineering Use: Twist bits are most suitable for DIY, home and general construction or engineering use, helps a lot 5、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 replacement