EnPoint&trade; High Precision 3.175mm HSS Shank 1.5-2.4mm Carbide Micro Drill Bits Set CNC Metal Engraving Boring Bits Set Amber Beeswax Hand Drill Twist Bits Set for Plastic Mold PCB SMT (10 pcs) High quality solid carbide tungsten steel processed for longer bit life, greater durablity Use of nano technology and advanced gringding processing provide more sharply cutting, less breaking Strict symmetrical cutting edge aviods drilling deviation; rich varieties of drill bits can meet the needs of different applications Large chip removal capacity, less drilling pollution, small drilling heat Mainly suitable for PCB, SMT, CNC, mold, plastic, copper, stainless steel and other precision metal parts processing