4. Features: aluminum alloy storage shell, high strength, sturdy and durable, light and portable, cylindrical storage compartment, easy to carry, high-viscosity vulcanized rubber strip, quick repair, easy to use, easy conversion of two kinds of drill bits, thread Rotating connection, easy to change
4. Features: aluminum alloy storage shell, high strength, sturdy and durable, light and portable, cylindrical storage compartment, easy to carry, high-viscosity vulcanized rubber strip, quick repair, easy to use, easy conversion of two kinds of drill bits, thread Rotating connection, easy to change