Design: professionally grind each spiral with self-tapping pilot design, and perfect, very convenient for manual drilling. Multiple Uses: used in cork/green wood projects such traps, chairs, mallets, ladders, maple syrup taps, and survival shelters. Camping Survival Tool: Throw it into your jungle craft backpack as the jungle craft tool, instead of other manual primitive tools and jungle craft survival tools! Perfect Size: Suitable for larger wooden rods to obtain greater torque and easier drilling! Throw it into your jungle craft backpack as the jungle craft tool instead of other manual primitive tools and jungle craft survival tools., Manufacturer: Akfldms