NONDK 20 Pieces 0.8mm Coated Tip Helicoidal Drill Bit for Glass Jewels Stone Tile

[APPLICATION] - Suitable for drilling small holes in glass, metal, seashells, jade, , marbles, stones, drywall, etc. Due to the different hardness of the material, the effect is also different. [SIZE] - Twist drill bit with 0.8mm / 0.03" shank. [MATERIAL]: coated high-speed steel (HSS) is manufactured by spiral technology, has toughness and hardness, not easy to break. The drill bit is and easy to remove chips. [APPLICABLE MACHINE]- Widely used in rotary tools such as hand drills, column drills, flexible shafts, bench drills and hanging mills. [NOTICE]- When drilling, it is necessary to add cutting fluid in time to lubricate and cool, which can get better drilling hole wall, prolong useful and drilling accuracy.