Auniwaig 1mm Diamond Twist Drill Bits High Speed Steel HSS Drill Bits for Glass Jewelry Beach Sea Shells Stone Gemstones Lapidary Ornament Bracelet Necklace Arts Crafts 10 Pcs - CU2701M3003HF-FBA

• 【Parameter】- Shank Diameter: 1mm/0.04 inch.Drill Bit Diameter: 1mm/0.04 inch.Surface Treatment: Electroplating. Material: Emery, HSS. 【Material】- 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. 【Applicable Machine】- This Diamond Twist Drill Bits are widely used in rotary tool such as hand drills, drill press, flex shafts, bench drill and hanging mill. 【Wide Application】- 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. 【Notice】- 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.