set 25 brocas para metal thunderweb hss g milwaukeeThe THUNDERWEB design is based on a conical core, which is narrower at the tip of the mouth and thicker at the end of the spiral. FEATURE Spiral section: Reinforced core of the drill bit thanks to its thickness Spiral Design The THUNDERWEB spiral removes chips quickly, dissipates heat better, increasing durability 4 cut point sharpened at 135 Precision starts, the bit does not slip on the surface The polished finish reduces friction and increases the