Utoolmart 1.2mm Diamond Twist Drill Bits High Speed Steel HSS for Glass Sea Shells Stone Tiles 10 Pcs

Product description Utoolmart Diamond Twist Drill Bits High Speed Steel HSS for Glass Sea Shells Stone Tiles Diamond coated high speed steel(HSS) is made by spiral technology has both toughness and hardness is not easy to break The drill bit is sharp and is easy for chip removal Widely used in rotary tool such as hand drills drill press flex shafts bench drill and hanging mill Suitable for drilling small holes on glass metal sea shells jade pearls marbles stones drywalls and son on Due to the different hardness of the material the effect is also different When drilling it is necessary to add cutting fluid in time to lubricate and cool down which can get a better drilling hole wall extends the service life and drilling accuracy