[SIZE] - 0.8mm diameter, 11mm length twist drill bit with 0.6mm shank. [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] - Widely used in rotary tool such as hand drills, drill press, flex shafts, bench drill and hanging mill. [APPLICATION] - Suitable for drilling small holes on glass, metal, sea shells, jade, pearls, marble, stones, drywall 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.
Add Water to Cool Down: The diamond drill bits will generate a lot of heat energy during high-speed rotation. Please add water to cool the drill bit, otherwise, the temperature will be too high and the diamond particles will fall off. High-speed Steel: Made of HSS twist drill bit and then electroplated diamond particles, so the part of the drill edge will be thicker. Not for Grinding: The diamond twist drill bits can not be used for grinding. The coating of the diamond drill bits after the grinding has been damaged, and can only be used as an ordinary HSS drill bit. Please note that this product is a mini drill bit, the size is small, confirm that this drill bit is suitable for your tool. To prevent the drill from slipping, keep the exposed part of the drill bit as short as possible to enhance the strength of the drill. Precautions for Use： 1. Before drilling, mark the position where you need to drill. If it is a material with a relatively smooth surface, it is recommended to cover it with clay and other items to avoid the drill bit from slipping on the surface of the product. 2. When drilling, you need to add water while drilling, or directly put the product into the water to drill, which can effectively reduce the wear and tear of the product in use. 3. Drilling needs to be effected at high speed, smooth and without shaking, lightly press, and can't be squeezed hard. The effect of punching is connected with the material and hardness of the hole. The higher the material hardness, the longer it takes.